Subtraction Within 20
A free printable subtraction within 20 worksheet with an answer key. Solve each problem. Count back or think addition! Perfect for 1st grade subtraction practice at home or in class.
- Size
- US Letter (8.5 × 11 in), fits A4
- 2 pages: the worksheet and its answer key
- Level
- Grade 1
- License
- Free for personal & classroom use
About this worksheet
A free printable subtraction within 20 worksheet with an answer key. Solve each problem. Count back or think addition! First graders can do it on their own once they know the strategy at the top of the page. Check each answer by adding it back to the number taken away.
On this sheet
30 problems, starting with 11 - 6, 16 - 12, 20 - 20, 20 - 12, 16 - 6, 17 - 1, 19 - 17, 13 - 6, 14 - 1, 11 - 11, 17 - 13, 16 - 5, 20 - 5, 17 - 8, and 16 more. The answers to all of them are on page 2.
Tips for using it
- Count back on your fingers or the number line for the hardest facts.
- Think addition: 12 - 7 asks what you add to 7 to make 12.
- For small numbers, counting back on a number line is a reliable strategy.
- When borrowing, cross out the digit you borrow from and write the new number above it.
Printing tips
Download the PDF and print at 100% (or “fit to page” on A4). Page 1 is the worksheet and page 2 is the answer key with the answers in red; print just page 1 if you want to keep the answers for checking. The PNG shows page 1 only. Free for personal, family and classroom use.
