Cardinal Math

Addition with regrouping · sheet 14 of 30

Answer key

The answer, and what a wrong answer means.

The sheet
#ProblemAnswerIf they wrote…
1 180 + 161 341 1241 carries two columns over2141 writes the whole column sum241 forgets the ten
2 14 + 69 83 713 writes the whole column sum73 forgets the ten
3 242 + 482 724 1624 carries two columns over6124 writes the whole column sum624 forgets the ten
4 498 + 166 664 1654 carries two columns over51514 writes the whole column sum554 forgets the ten
5 185 + 283 468 1368 carries two columns over3168 writes the whole column sum368 forgets the ten
6 579 + 177 756 1746 carries two columns over61416 writes the whole column sum646 forgets the ten
7 31 + 59 90 80 forgets the ten810 writes the whole column sum
8 36 + 47 83 713 writes the whole column sum73 forgets the ten
9 265 + 138 403 3913 writes the whole column sum393 forgets the ten493 carries two columns over
10 223 + 347 570 560 forgets the ten5610 writes the whole column sum660 carries two columns over
11 249 + 179 428 1418 carries two columns over31118 writes the whole column sum318 forgets the ten
12 203 + 107 310 300 forgets the ten3010 writes the whole column sum400 carries two columns over
13 209 + 727 936 26 carries two columns over9216 writes the whole column sum926 forgets the ten
14 12 + 38 50 40 forgets the ten410 writes the whole column sum
15 45 + 16 61 51 forgets the ten511 writes the whole column sum
16 28 + 23 51 41 forgets the ten411 writes the whole column sum
17 412 + 288 700 690 forgets the ten6910 writes the whole column sum790 carries two columns over
18 73 + 28 101 91 forgets the ten911 writes the whole column sum
19 278 + 128 406 3916 writes the whole column sum396 forgets the ten496 carries two columns over
20 27 + 73 100 90 forgets the ten910 writes the whole column sum

Reading the wrong answers

One wrong answer is a slip. The same pattern on three or more problems is a rule your child is following, and it has a name and a fix in the guide. Problems marked "no pattern to catch" are the plain ones; a child who gets only those right is telling you something too.

Writes the whole column sum 20 of 20 problems

Writes each column's full total into the answer: 8 and 5 are 13, so 13 goes down; 3 and 4 are 7.

38 + 45 they write 713 it is 83

Forgets the ten 20 of 20 problems

Adds each column and keeps only the ones digit of the total. The ten that should move left gets dropped.

38 + 45 they write 73 it is 83

Carries two columns over 12 of 20 problems

The carried ten skips a column and lands two places left, where it's worth a hundred.

375 + 182 they write 1457 it is 557

Not sure which? The five-minute check picks the problems that tell the patterns apart and names the one it sees.