← Back to Missing Numbers

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.

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.

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.