Cardinal Math

Addition with regrouping · sheet 22 of 30

Answer key

The answer, and what a wrong answer means.

The sheet
#ProblemAnswerIf they wrote…
1 393 + 483 876 1776 carries two columns over7176 writes the whole column sum776 forgets the ten
2 17 + 36 53 413 writes the whole column sum43 forgets the ten
3 129 + 242 371 361 forgets the ten3611 writes the whole column sum461 carries two columns over
4 14 + 16 30 20 forgets the ten210 writes the whole column sum
5 191 + 360 551 1451 carries two columns over4151 writes the whole column sum451 forgets the ten
6 445 + 259 704 6914 writes the whole column sum694 forgets the ten794 carries two columns over
7 19 + 11 30 20 forgets the ten210 writes the whole column sum
8 14 + 87 101 91 forgets the ten911 writes the whole column sum
9 22 + 19 41 31 forgets the ten311 writes the whole column sum
10 138 + 262 400 390 forgets the ten3910 writes the whole column sum490 carries two columns over
11 11 + 39 50 40 forgets the ten410 writes the whole column sum
12 469 + 129 598 5818 writes the whole column sum588 forgets the ten688 carries two columns over
13 292 + 351 643 1543 carries two columns over5143 writes the whole column sum543 forgets the ten
14 13 + 87 100 90 forgets the ten910 writes the whole column sum
15 129 + 109 238 2218 writes the whole column sum228 forgets the ten328 carries two columns over
16 209 + 498 707 6917 writes the whole column sum697 forgets the ten797 carries two columns over
17 169 + 177 346 1336 carries two columns over21316 writes the whole column sum236 forgets the ten
18 275 + 198 473 1463 carries two columns over31613 writes the whole column sum363 forgets the ten
19 53 + 17 70 60 forgets the ten610 writes the whole column sum
20 158 + 374 532 1522 carries two columns over41212 writes the whole column sum422 forgets the ten

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.