Add within 20
2 printable PDFs, each with its answer key. These sheets practice addition facts with sums up to 20, written across, like 9 + 6 = ☐.
Sheet 1
Sheet 2
What's on the sheet
36 problems written across, with a box for each answer, on US Letter paper, with a box for the score. Some from sheet 1:
- 4 + 5 = 9
- 6 + 9 = 15
- 9 + 7 = 16
- 5 + 9 = 14
Helping at home
In 1st grade, children add within 20 and become fluent with the facts within 10. They learn strategies that make the bigger facts easier: counting on, making a ten (9 + 6 is 10 + 5), and using doubles (6 + 6 = 12, so 6 + 7 = 13).
The usual slip is counting on and landing one off, often by counting the starting number again. Another is not noticing that the order does not matter: 2 + 9 is the same as 9 + 2, and starting from 9 is much quicker.
One way to help at home: ask "which number is bigger?" and start from it. For facts near 10, ask how many more make 10. Keep it short: one sheet, then talk about which problems felt easy and which were slow. The slow ones are the facts to practice next.
Practice the same skill as a game
In larkit, your child plays this skill on screen, with a second try and a hint when a problem is hard. Free to try, no ads.
Play it freeWant more sheets?
The free sheets above need no email. If you'd like extras, we can send them.
Common Core: 1.OA.C.6