Cardinal Math

Multi-digit multiplication · sheet 16 of 30

Answer key

The answer, and what a wrong answer means.

The sheet
#ProblemAnswerIf they wrote…
1 391 × 2 782 no pattern to catch here
2 23 × 5 115 no pattern to catch here
3 42 × 3 126 no pattern to catch here
4 74 × 4 296 no pattern to catch here
5 92 × 7 644 no pattern to catch here
6 27 × 5 135 no pattern to catch here
7 13 × 51 663 503 leaving out a partial product78 forgetting to shift the second row
8 855 × 3 2565 no pattern to catch here
9 33 × 24 792 198 forgetting to shift the second row612 leaving out a partial product
10 71 × 6 426 no pattern to catch here
11 12 × 53 636 506 leaving out a partial product96 forgetting to shift the second row
12 439 × 9 3951 no pattern to catch here
13 31 × 47 1457 1207 leaving out a partial product341 forgetting to shift the second row
14 933 × 3 2799 no pattern to catch here
15 12 × 66 792 144 forgetting to shift the second row612 leaving out a partial product
16 59 × 81 4779 4009 leaving out a partial product531 forgetting to shift the second row
17 92 × 3 276 no pattern to catch here
18 43 × 66 2838 2418 leaving out a partial product516 forgetting to shift the second row
19 79 × 3 237 no pattern to catch here
20 77 × 15 1155 462 forgetting to shift the second row735 leaving out a partial product

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. Problems marked "no pattern to catch" are the plain ones; a child who gets only those right is telling you something too.

Leaving out a partial product 8 of 20 problems

Forgetting to shift the second row 8 of 20 problems