Worksheet

Toy Factory Number Machines

Grade 1 toy factory worksheet: find the unknown number in addition and subtraction equations with number machines and stories.

Grade 1MathInteractive · Printable

Aligned to1.OA.D.8

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What’s included

Single worksheet
Auto-graded online
1 Common Core standard
Printable answer key
13 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 1
Subject: Math
Question types: Fill in the blank, Multiple choice, Circle the answer, Short answer

About this worksheet

What students practice

Students find the unknown number in addition and subtraction equations within 20.
Students solve equations with the unknown in any spot, including before the equal sign.
Students write an equation with an unknown to match a story.

How to use

Work through Machine A together, reading each equation aloud as "what number plus 6 makes 13?". Then let students finish on their own; counters or a number line can help.

Curriculum

Common Core standard covered

1.OA.D.8

Find the unknown number in an addition or subtraction equation.

Preview

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Name Date

Toy Factory Number Machines

Find the missing number in each equation.

Number machines

Each machine changes every number that goes in. Write the missing numbers.

Machine A adds 6 to every number.

9 + 6 =
+ 6 = 13
+ 6 = 10

Machine B takes away 4 from every number.

12 − 4 =
− 4 = 11
− 4 = 5

A mystery machine changes 8 into 13. It changes 10 into 15. What does the machine do?
8 + ? = 13
10 + ? = 15

A. It adds 13.
B. It takes away 5.
C. It adds 2.
D. It adds 5.

Machine C takes away the same number every time. It changes 17 into 9.

17 − = 9
Machine C changes 14 into .

Factory equations

Find the number that makes each equation true.

+ 8 = 12
15 = + 7
13 − = 4
− 5 = 7
6 = 16 −
= 7 + 7

A box holds 16 toy cars. 7 cars are red. The rest are blue. Which equation can you use to find the number of blue cars?

A. 16 + 7 = ?
B. ? − 7 = 16
C. 7 + ? = 16
D. 7 − ? = 16

Circle every equation where ? is 8.

? + 5 = 139 + ? = 1614 − ? = 6? − 8 = 817 = 9 + ?12 − ? = 5? = 4 + 4

Both sides of the equal sign must make the same number. Find the missing number.

8 + 5 = + 6

Factory stories

Write the missing number in each equation to answer the question.

The factory makes 9 teddy bears in the morning. It makes more bears in the afternoon. It makes 15 bears in all. How many bears does it make in the afternoon?

9 + = 15

10.

Some yo-yos are on a shelf. A worker packs 6 yo-yos in a box. Now 7 yo-yos are left on the shelf. How many yo-yos were on the shelf at first?

− 6 = 7

11.

A robot has 18 bolts. It uses some bolts to build a toy truck. It has 10 bolts left. How many bolts did it use?

18 − = 10

12.

Which equation has the same missing number as 5 + ? = 12?

A. 5 + 12 = ?
B. ? − 5 = 12
C. 12 − 5 = ?
D. 12 − 7 = ?

13.

The factory needs 20 toy boats. It has made 12 boats. How many more boats does it need to make? Write an equation with a ? for the missing number. Then solve it.