Math worksheet
Addition and Subtraction Within 20 Worksheets
Addition and subtraction facts mixed on one page, so children read each sign before they solve.
Free printable PDF
Download this sheet and its answer key as shown, and print it at home or school. No account needed.
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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
Mixed sheets check something single-operation sheets cannot: whether children notice the sign. It is common for a child who has just done a page of addition to add every problem on a mixed page. Each problem here is randomly addition or subtraction, with all numbers and answers within 20.
If signs are being missed, ask your child to circle every minus sign before starting. Once that habit is in place, the mixed page becomes a good weekly review.
- 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
- Why use mixed addition and subtraction worksheets?
- They make children read the operation sign on every problem and show whether both kinds of facts are secure.
- Are the answers ever negative?
- No. Subtraction problems always take a smaller number from a larger one.
- Are these addition and 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.