Math Grade 2,3

Class A has 24 students, Class B has 15 students. How many more student does class A have than class B?

There are 20 birds perch on the tree, 10 more birds come and 7 birds fly away. How many birds left?

There are 4 students in the class, then 2 more come in. How many students does the class have now?

A subject needs 2 books to study. If there are 5 subjects - How many books do you need in total?

Coca bought 2 books, each book cost $4. How many did he pay?

Tiffany has 27 pencils. Coca borrows 9 pencils. How many pencils does Tiffany have now?

Nicky had 10 packs of snack, Benjamin ate 2 packs of snack, Avocado ate one pack of snakc. How many did he have left?

Benjamin ate 41 candies, Tiffany ate 19 candies. How many fewer candies did Tiffany eat than Benjamin?

There are 200 candies, Coca eats 50 candies. Then he buys 100 more candies - How many candies does he have now?