Unknown Parts (Word Problems)

Troy has some apples. He gets 12 more from the store. Now Troy has 27 apples. How many apples did he start with?

Which equation can you use to solve the problem?

• ? + 27 = 12

• 27 + 12 = ?

• 12- 27 = ?

• 27 - 12 = ?

Helena makes 24 cupcakes in the morning. Then she makes some more cupcakes in the afternoon. Now she has 52 cupcakes. How many cupcakes did she make in the afternoon?

• 32

• 28

• 29

• 38

Which two equations can be used to find the missing part?

• 23 + ? = 43

• 43 + ? = 23

• 23- ? = 43

• 43 - 23 = ?

Ellie has 15 marbles. She finds some more marbles under her bed. Now she has 40 marbles. How many marbles did she find under his bed?

• 25

• 30

• 35

• 20

Landon bakes 18 cookies in the morning. He bakes some more in the evening. Now he has 45 cookies. How many cookies did he bake in the evening?

• 27

• 22

• 30

• 25