Addition Within 20 With Regrouping: Worksheet #1
Every one of these thirty problems crosses a ten: this addition within 20 with regrouping sheet is for children aged 6-7 who know their bonds to 10 and are ready for 6 + 9.
2 A4 pages · for home and classroom use
Labugen
Addition up to 20 with regrouping
set no. 104
- 1.6 + 9 =
- 2.16 + 4 =
- 3.3 + 8 =
- 4.15 + 5 =
- 5.18 + 2 =
- 6.7 + 4 =
- 7.7 + 9 =
- 8.6 + 7 =
- 9.8 + 12 =
- 10.19 + 1 =
- 11.2 + 9 =
- 12.8 + 6 =
- 13.4 + 16 =
- 14.8 + 4 =
- 15.9 + 4 =
- 16.6 + 14 =
- 17.8 + 7 =
- 18.5 + 7 =
- 19.8 + 9 =
- 20.9 + 6 =
- 21.13 + 7 =
- 22.8 + 2 =
- 23.9 + 8 =
- 24.7 + 3 =
- 25.11 + 9 =
- 26.9 + 2 =
- 27.6 + 8 =
- 28.2 + 18 =
- 29.1 + 19 =
- 30.17 + 3 =
How to use this worksheet
- Start with problem 1, 6 + 9. Say together: "9 needs 1 to make 10, take the 1 from the 6, and 5 are left: 15."
- Continue in order, saying the ten-step aloud for the first few problems.
- Circle the problems whose answer is exactly 20 (there are twelve, such as 16 + 4 and 13 + 7) and notice how quickly they go.
- Check with the second page and redo any mistakes the next day.
What this worksheet teaches
Here, "with regrouping" means the ones add up to 10 or more, so a new ten is formed. Sixteen problems have sums in the teens (6 + 9, 3 + 8, 7 + 4), twelve reach exactly 20 (16 + 4, 15 + 5, 1 + 19) and two reach exactly 10 (8 + 2, 7 + 3). Mastering this step is a big milestone of first grade and prepares children for carrying in column addition.
The make-ten strategy
Break the smaller number so the larger one reaches ten: 7 + 4 = 7 + 3 + 1 = 11, and 8 + 6 = 8 + 2 + 4 = 14. Near doubles help too: 8 + 9 is one more than 8 + 8, so 17. The page also has turnaround pairs (6 + 9 and 9 + 6, 8 + 6 and 6 + 8, 9 + 2 and 2 + 9): solving one gives the other for free.