Subtraction within 20
Free worksheets for Grade 1. 20 problems per page, a new sheet at every click, with an answer key.
Sheets are A4. On US Letter paper, choose "Fit to page" (or "Scale to fit") in your print settings. Free, with no sign-up.
Subtraction within 20 worksheets are made automatically from the choices you make: the operation and the kind of problem. Every click on "New sheet" gives different problems (20 on a page), so you can practice daily without repeating a sheet.
Within 20 the main difficulty is crossing ten (8 + 5, 13 − 6). Most problems on these sheets cross ten, because that is where Grade 1 children need the most practice. A useful strategy is to make ten first: 8 + 5 is 8 + 2 + 3.
Tip for parents: one sheet a day, about ten minutes. If the sheet feels too hard, go back to a smaller range. If it feels too easy, choose missing-number or vertical problems.
Frequently asked questions
Which grade are the subtraction within 20 sheets for?
They are designed for Grade 1, but any child practicing within 20 can use them.
What is the "missing number" type?
One of the numbers is missing instead of the answer, for example 4 + ___ = 9. It builds the link between addition and subtraction.
Is there an answer key?
Yes. Tick "Add an answer key" and every sheet is followed by a page with the answers in color.
Explore more: Addition and subtraction within 10, Addition and subtraction within 20, Addition within 100, and All printable worksheets.