3rd grade math

Sarah has 12 apples. She buys 8 more. How many apples does she have now?

Tom has 15 toy cars. His friend gives him 9 more. How many toy cars does Tom have in total?

There are 7 birds in a tree. 4 more birds land in a tree. How many birds are in the tree now?

Lisa read 10 pages of her book in the morning and 6 pages in the evening. How many pages did she read that day?

Jake has 23 marbles. He finds 13 more marbles in his drawer. How many marbles does he have altogether?

Emily has 18 cookies. She gives 5 to her friend. How many cookies does Emily have left?

There are 20 students in a class. 6 of them are absent today. How many students are at school?

There were 25 balloons at the party. 9 of them popped. How many balloons are still whole?

Mark has 30 candies. He eats 7 candies after lunch. How many candies does he have remaining?

Alex has 15 pencils. He loses 4 of them. How many pencils does he still have?