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Subtraction within 20 - Worksheet 5 - 1st Grade

Medium

Subtract with minuends up to 20 (Medium)

24 problems · 10-15 minutes · Skills: subtraction, mental math

About This Worksheet

This medium-level worksheet contains 24 problems designed for 1st Grade students practicing subtraction within 20. Medium worksheets introduce larger numbers and varied question formats to deepen understanding and build fluency.

Subtraction across ten is a key milestone. The strategies learned here — like breaking apart numbers — apply to subtracting much larger numbers.

  • Subtract with minuends up to 20
  • Use the "break apart to ten" strategy
  • Solve subtraction problems that cross the tens boundary
  • Use known addition facts to quickly find differences
  • Apply subtraction within 20 in real-world contexts

How to Solve: Worked Example

Example Problem: 14 − 6 = ___
Solution Steps:
  1. Break it into two steps: first subtract to reach 10.
  2. 14 − 4 = 10 (subtract 4 of the 6).
  3. 10 − 2 = 8 (subtract the remaining 2).
Answer: 8
Tip: When subtracting across 10, break it into two steps — go to 10 first, then keep going.
1
16 - 9 =
2
10 - 5 =
3
16 - 8 =
4
16 - 7 =
5
10 - 3 =
6
16 - 5 =
7
13 - 9 =
8
15 - 7 =
9
16 - 7 =
10
10 - 3 =
11
15 - 10 =
12
10 - 3 =
13
16 - 8 =
14
12 - 10 =
15
14 - 10 =
16
11 - 8 =
17
16 - 9 =
18
12 - 2 =
19
12 - 7 =
20
15 - 12 =
21
14 - 5 =
22
12 - 9 =
23
14 - 5 =
24
16 - 11 =

Answer Key

1. 72. 53. 84. 95. 76. 117. 48. 89. 910. 711. 512. 713. 814. 215. 416. 317. 718. 1019. 520. 321. 922. 323. 924. 5

Frequently Asked Questions

How do I download this subtraction within 20 - 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, mental math. 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 24 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.