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1. Addition, subtraction, multiplication and division are called the

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operations.

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2. A pneumonic device to help you remember the order of operations is

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PEMDAS.

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3. If an equation contains both addition and subtraction with neither in parenthesis, you do the first one

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first.

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4. If an equation contains both multiplication and division with neither in parenthesis, you do the first one

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first.

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5. The answer to an addition problem is a

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sum.

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6. The answer to a subtraction problem is the

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difference.

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7. The answer to a division problem is a

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quotient.

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8. The answer to a multiplication problem is a

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product.

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9. A lower case letter that stands for an unknown number is a

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variable.

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10. A complete number sentence with an equal sign is called an

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equation.

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11. A combination of numbers and algebraic terms which does not include an equal sign is an

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expression.

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12. An expression does not contain an

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equal sign.

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13. To multiply by 10, move the decimal one place to the

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right.

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14. To multiply by 100, move the decimal two places to the

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right.

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15. To divide by 10, move the decimal one place to the

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left.

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16. To divide by 100, move the decimal two places to the

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left.

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17. Fractions and decimals can be multiplied and divided, but percents

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cannot.

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18. By dividing the numerator by the denominator, a fraction is changed to a

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decimal.

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19. Moving the decimal two places to the right changes a decimal number to a

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percent.

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20. A percent can be changed to a fraction by putting the number over 100 and

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reducing to lowest terms.

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21. When dividing a fraction to change it to a decimal, the top number goes in the

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"house".

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22. To change a percent to a decimal, remove the percent sign and

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move the decimal two places to the left.

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23. To add or subtract fractions, you must first find a common denominator and

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change both fractions.

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24. To add or subtract decimals, you must first

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align the decimals.

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25. To multiply decimals, you multiply the problem first and then put the decimal in the answer,

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counting the same number of decimal places from the right as found in the problem.

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26. To divide by a decimal, change the divisor to a whole number and move the decimal in the dividend

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the same number of places to the right.

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27. To multiply fractions, multiply the numerators and denominators

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straight across and simplify.

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28. To divide fractions,

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flip the second fraction and multiply.

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29. A triangle with all sides congruent is

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equilateral.

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30. A triangle with two congruent sides is

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isosceles.

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31. A triangle with no congruent sides is

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scalene.

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32. Every triangle can be classified by its

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sides or angles.

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33. A triangle with two congruent angles and two congruent sides is

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isosceles.

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34. A triangle with 2 acute angles and one obtuse angle is

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obtuse.

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35. A triangle with 3 angles which measure less than 90° is

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acute.

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36. A triangle with one angle which measures exactly 90° is

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right.

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37. Two values that are the same are

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equal.

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38. Two shapes that are exactly the same are

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congruent.

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39. Two shapes that are the same shape but different sizes are

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similar.

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40. A number can be divided evenly by 2 if it is

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even.

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41. A number can be divided evenly by 5 if it ends

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in 5 or 0.

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42. A number can be divided evenly by 3 if the sum of its digits can be divided evenly by

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3

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43. A number can be divided evenly by 9 if the sum of its digits can be divided evenly by .

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9

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44. A number can be divided evenly by 6 if it is even and can be divided by

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3

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45. A closed figure made of straight lines is a

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polygon.

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46. A polygon with 5 sides is a

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pentagon.

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47. A polygon with 6 sides is a

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hexagon.

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48. A polygon with 7 sides is a

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heptagon.

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49. A polygon with 8 sides is an

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octagon.

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50. A polygon with 10 sides is a

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decagon.

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51. A polygon with 4 sides is a

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quadrilateral.

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52. The symbol for "is less than" is

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<.

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53. When placing numbers on a number line, negative numbers always go the

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left of zero.

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54. When comparing two numbers, the largest is always the one to the

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right on a number line.

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55. When comparing two fractions with different denominators, use the

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bottoms-up method.

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56. When comparing 3 or more fractions with different denominators, you must find a

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common denominator.

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57. When comparing decimals, write the decimals in a list,

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align the decimals, annex zeros, and compare.

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58. An angle measuring exactly 90°is a

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right angle.

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59. An angle measuring less that 90°is called

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acute.

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60. An angle measuring more than 90°is called

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obtuse.

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61. An angle measuring exactly 180°is called a

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straight angle.

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62. Two angles which are next to each other and share a leg are said to be

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adjacent.

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63. Two angles whose measurement totals 90°are

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complementary.

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64. Two angles whose measurement totals 180° are

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supplementary.

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65. When two lines cross, the two angles directly across from each other look like kissing foxes and are classified as

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vertical angles.

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66. Lines that cross are

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intersecting lines.

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67. Lines that cross at a 90° angle are

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perpendicular lines.

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68. Two lines that are in the same plane and stay the same distance apart are

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parallel lines.

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69. Two lines that are not in the same plane and never touch are

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skew lines.

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70. Numbers that only have themselves and one as factors are

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prime numbers.

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71. Numbers that are not prime are

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composite.

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72. Little numbers that are multiplied to make a product are called

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factors.

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73. Two numbers equal distance from zero are called

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opposites.

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74. The distance a number is from zero is called its

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absolute value.

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75. The smallest number in a set of data is called the

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minimum.

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76. The highest number in a set of data is called the

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maximum.

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77. The middle number in a set of data is called the

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median.

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78. The average is also called the

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mean.

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79. To solve for the variable in a one-step equation, you must do the

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inverse operation.

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80. On a coordinate plane, the horizontal number line is called the

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x-axis.

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81. On a coordinate plane, the vertical number line is called the

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y-axis.

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82. The place where the x- and y-axis cross is called the

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origin.

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83. The points on a coordinate plane are designated by two numbers in parenthesis called the

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ordered pair.

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84. In an ordered pair, the first number tells you to go left or right from the

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origin.

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85. In an ordered pair, the second number tells you to go up or down from the

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x-axis.

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86. Compound probability can be displayed by making a

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list or drawing trees.

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87. The list of all possible outcomes when figuring probability is known as a

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sample space.

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88. The result of an experiment or even is an

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outcome

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89. An outcome is always shown as a

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whole number.

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90. Probability is shown as a

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decimal or a fraction.

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91. Sliding a point or one dimensional figure on a coordinate plane is called

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translation.

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92. Flipping a point over an axis on a coordinate plane is called

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reflection.

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93. Turning a figure around a point on a coordinate plane is called

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rotation.

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94. To convert a metric measurement to a smaller unit, move the decimal to the

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right.

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95. To convert a metric measurement to a larger unit, move the decimal to the

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left.

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96. The formula for perimeter of a polygon is

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add all sides.

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97. The formula for area of a square is

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side squared. (length x width)

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98. The formula for area of a rectangle is length times

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width.

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99. The formula for area of a triangle is base times height divided by

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two.

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100. The area of a polygon is always labeled in

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square units.

6th Grade Math – 100 things to know – Flashcards

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