Math worksheet
Subtraction Within 20 Worksheets
Subtraction facts from numbers up to 20, including the harder ones that cross ten like 15 − 8.
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- Grade
- Grade 1
- Ages
- 6–7
- Problems per page
- 20
- Format
- Stacked in columns
- Answer key
- Included
- Paper
- US Letter or A4
About this worksheet
Subtracting within 20 is a first-grade fluency goal. The hardest facts are the ones that cross ten, such as 13 − 5 and 15 − 8. Two strategies help: count up from the smaller number to the larger (from 8 to 10 is 2, from 10 to 15 is 5, so 7), or use the matching addition fact.
Every answer is zero or more. Once these come easily, two-digit subtraction is the next step.
- 01
Answer key included
Every sheet ends with a matching answer key page, so checking work takes seconds.
- 02
New problems in one click
Open the sheet in the editor and generate a fresh set with the same settings whenever you need another page.
- 03
Sized for young writers
Large digits with room to write each answer, on US Letter or A4 paper.
Questions
- What is the best strategy for facts like 14 − 6?
- Thinking addition is usually fastest: 6 plus what makes 14? Counting up through ten (6 to 10 is 4, then 4 more is 14, so 8) works well too.
- Are all the answers positive?
- Yes. The number subtracted is never larger than the starting number.
- Are these subtraction within 20 worksheets free?
- Yes. The sample sheet on this page, with its answer key, is a free PDF in US Letter or A4, no account needed. Generating and previewing new problems is free too; printing and downloading custom sheets come with Pro, which also removes the preview watermark.