Here you must use the proper form of the verb AVOIR.
Let’s repeat the verb AVOIR: j’ai, tu as, il (elle, on) a, nous avons, vous avez, ils (elles) ont

So, in this case for Camille (she, 3rd person sg.) you will use “a”, but at the same time use the right form of plural for the nouns that end in -al. You will remove the ending -al and add the ending -aux.
You could as well write the number with letters – deux.

Camille a 2 animaux.

Here you must use the proper form of the verb AVOIR, which in this case for Simon (he, 3rd person sg.) is “a”, but at the same time use the right form of plural for the nouns that end in -eu, as they have irregular plural. You will just add -x.(jeu, sg. game. Jeux, pl. games).
You could as well write the number with letters – quinze.

Simon a 15 jeux.

The right form of the verb AVOIR in this case for Fatima and Mina (Elles – they, 3rd person pl.) is “ont”. To form plural in this case is easy as “dessin” has a regular form of plural. You just add an -s to the singular form – dessins.
You can write the number with letters – dix-sept.

Fatima et Mina ont 17 dessins.

Use the proper form of the verb AVOIR, which in this case for M. Coulon (he, 3rd person sg.) is “a”. To form the right form of plural for the nouns that end in -eau (1 tableau), add -x to the end (2 tableaux).
You could as well write the number with letters – trois.

M. Coulon a 3 tableaux.

Ludovic and Yann are THEY, in French ILS. The right form of the verb AVOIR, here is ONT (ils ont, 3rd person pl.) In order to create plural form, you just add an -s to “crayon” as this word has a regular plural, like the majority of French nouns.
The number in letters here is – trente.

Ludovic et Yann ont 30 crayons.

Gaëlle is SHE, in French ELLE, so the right form of the verb AVOIR is A – Elle a….
To create plural form with this noun that ends in – al (journal), remove -al and add -aux (journaux).
27 – vingt-sept

Gaëlle a 27 journaux.