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Missing Numbers - Worksheet 5 - 1st Grade

Medium

Find missing numbers in subtraction equations (Medium)

18 problems · 10-15 minutes · Skills: subtraction, algebraic thinking

About This Worksheet

This medium-level worksheet contains 18 problems designed for 1st Grade students practicing missing numbers. Medium worksheets introduce larger numbers and varied question formats to deepen understanding and build fluency.

Finding missing values in subtraction builds algebraic reasoning and reinforces the connection between addition and subtraction.

  • Find missing numbers in subtraction equations
  • Use addition to solve for unknowns
  • Strengthen the relationship between addition and subtraction
  • Fill in the missing minuend, subtrahend, or difference
  • Write the related addition fact to verify a missing number

How to Solve: Worked Example

Example Problem: ___ − 3 = 5
Solution Steps:
  1. The missing number is the starting value.
  2. Use addition: 5 + 3 = 8.
  3. Check: 8 − 3 = 5. Correct!
Answer: 8
Tip: When the starting number is missing, add the other two numbers together.
1
6 - ___ = 4
2
___ - 3 = 8
3
___ - 5 = 8
4
___ - 2 = 4
5
___ - 10 = 1
6
___ - 3 = 6
7
14 - ___ = 13
8
12 - ___ = 4
9
11 - ___ = 5
10
___ - 3 = 4
11
___ - 2 = 6
12
___ - 3 = 10
13
___ - 6 = 5
14
10 - ___ = 5
15
6 - ___ = 2
16
7 - ___ = 6
17
___ - 12 = 1
18
___ - 5 = 3

Answer Key

1. 22. 113. 134. 65. 116. 97. 18. 89. 610. 711. 812. 1313. 1114. 515. 416. 117. 1318. 8

Frequently Asked Questions

How do I download this missing numbers - worksheet 5 worksheet?

Click the "Download PDF / Print" button at the top of the worksheet. You can save it as a PDF or print it directly. The answer key will be on a separate page.

How do I find worksheets at different difficulty levels?

Each subtopic has 10 worksheets: Worksheets 1-3 are Easy, 4-7 are Medium, and 8-10 are Hard. Start with Easy worksheets to build confidence, then progress to harder ones.

What skills does this subtraction worksheet cover?

This worksheet focuses on subtraction, algebraic thinking. It is designed for 1st Grade students and provides structured practice through varied problem types with a worked example to guide students before they begin.

Can I use this worksheet in my classroom?

Yes. All worksheets on K12Worksheets are free for classroom use. You can print copies for your entire class. With 10 worksheets per subtopic at three difficulty levels, you have plenty of options for differentiated instruction and individualized practice.

How many problems are on this worksheet?

This worksheet contains 18 problems. It typically takes 10-15 minutes to complete. An answer key with all solutions is included so parents and teachers can check work quickly.