Addition Within 100 With Regrouping: Worksheet #1
Carrying the ten in every single problem: addition within 100 with regrouping, forty column sums for ages 7-8 who can already add two-digit numbers without carrying.
2 A4 pages · for home and classroom use
Labugen
Addition up to 100 with regrouping
set no. 202
- 55+37
- 37+3
- 88+3
- 38+9
- 58+24
- 44+29
- 88+5
- 37+17
- 6+55
- 3+7
- 45+27
- 26+19
- 45+36
- 25+19
- 28+48
- 21+59
- 18+19
- 27+15
- 45+37
- 95+5
- 59+25
- 38+43
- 57+16
- 13+59
- 18+36
- 27+48
- 36+57
- 75+17
- 22+59
- 49+46
- 78+15
- 59+3
- 45+28
- 58+36
- 28+62
- 79+9
- 25+58
- 69+14
- 64+9
- 7+68
How to use this worksheet
- Model the first problem, 55 + 37: 5 + 7 = 12, write 2 in the ones, put a small 1 above the tens; then 5 + 3 + 1 = 9, answer 92.
- In the first rows, have your child write the carried 1 every time, even if they can hold it in their head.
- Watch for 95 + 5 in the fourth row: the answer, 100, needs three digits, so leave room on the left.
- Check each row of five with the answer key, counting across, before moving on.
What this worksheet teaches
Every problem has ones that add up to 10 or more, so a ten is carried every time. Twenty-nine problems add two two-digit numbers (58 + 24, 26 + 19, 49 + 46), and eleven add a one-digit number (37 + 3, 88 + 3, 6 + 55). One problem is as small as 3 + 7 = 10 and one reaches 100. The whole page builds an automatic habit: ones first, then the carried ten.
Carrying the ten
Carrying works because 10 ones are the same as 1 ten. In 26 + 19, the ones make 6 + 9 = 15, which is 1 ten and 5 ones: the 5 stays, the ten joins the tens column. Estimating first catches most slips: 58 + 24 is close to 60 + 20 = 80, so 82 is believable, while 72 would mean the carried ten was forgotten.