Solve & Write Equations: Fun with Missing Numbers in Addition

Lily has 5 apples. She buys some more apples and now has 12 apples. How many apples did she buy? Write an equation to show your work.

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Tom has 8 toy cars. His friend gives him some more toy cars, and now he has 15 toy cars. How many toy cars did his friend give him? Write an equation to find the answer.

• 7

• 3

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There are 10 birds on a tree. 7 more birds join them. How many birds are there now? Write an equation to solve the problem.

• 10

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Sarah has 6 balloons. She gets some more balloons for her birthday and now has 14 balloons. How many balloons did she get? Write an equation to find the missing number.

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In a box, there are 9 cookies. If you add some cookies and now have 20 cookies, how many cookies did you add? Write an equation to show your work.

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• 12

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A farmer has 11 cows. He buys some more cows and now has 20 cows. How many cows did he buy? Write an equation to find the answer.

• 12

• 9

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Emma has 4 books. She finds some more books and now has 10 books. How many books did she find? Write an equation to solve the problem.

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There are 13 students in a class. If 5 more students join, how many students are there now? Write an equation to find the total number of students.

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Jack has 7 marbles. He wins some more marbles in a game and now has 15 marbles. How many marbles did he win? Write an equation to show your work.

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• 12

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• 5

A gardener planted 12 flowers. If he plants some more flowers and now has 20 flowers, how many flowers did he plant? Write an equation to find the missing number.

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