Addition Within 20 Without Regrouping: Worksheet #1
Thirty problems of addition within 20 without regrouping: the ones never add up past 9, so children aged 6-7 can focus on how teen numbers are built.
2 A4 pages · for home and classroom use
Labugen
Addition up to 20 without regrouping
set no. 103
- 1.10 + 7 =
- 2.6 + 10 =
- 3.16 + 2 =
- 4.4 + 5 =
- 5.14 + 3 =
- 6.15 + 4 =
- 7.7 + 1 =
- 8.5 + 11 =
- 9.1 + 2 =
- 10.4 + 3 =
- 11.6 + 2 =
- 12.13 + 6 =
- 13.11 + 6 =
- 14.1 + 7 =
- 15.5 + 4 =
- 16.2 + 15 =
- 17.11 + 7 =
- 18.16 + 1 =
- 19.12 + 5 =
- 20.14 + 4 =
- 21.16 + 3 =
- 22.6 + 1 =
- 23.12 + 4 =
- 24.11 + 2 =
- 25.12 + 1 =
- 26.4 + 15 =
- 27.1 + 1 =
- 28.10 + 10 =
- 29.12 + 2 =
- 30.3 + 6 =
How to use this worksheet
- Before starting, find problems 5 and 10 together: 14 + 3 and 4 + 3. Ask what is the same and what is different.
- Solve in number order, from 1 to 30; the numbering runs across each row.
- For a teen number plus a small number, cover the ten with a finger and add only the ones, then put the ten back.
- Compare with the answer page, which repeats all 30 problems with the answers in bold.
What this worksheet teaches
In every problem the ones digits add up to 9 or less, so no new ten is formed. That lets children see that 12 + 5 is simply one ten plus 2 + 5 ones. Not every problem is in the teens: ten of them stay within 10 (4 + 5, 1 + 2, 6 + 2), nineteen have sums from 11 to 19, and one, 10 + 10, makes 20. This mix links known facts to their bigger cousins.
Spot the look-alike pairs
The page hides several pairs that differ only by a ten: 4 + 3 and 14 + 3, 6 + 1 and 16 + 1, 1 + 2 and 11 + 2, 6 + 2 and 16 + 2 and 5 + 4 and 15 + 4. If 4 + 3 = 7, then 14 + 3 must be 17. Finding these pairs is a quick way to understand place value: the ten stays a ten, and only the ones change.