Cardinal Math

Multi-digit multiplication · sheet 11 of 30

Answer key

The answer, and what a wrong answer means.

The sheet
#ProblemAnswerIf they wrote…
1 31 × 39 1209 372 forgetting to shift the second row909 leaving out a partial product
2 379 × 7 2653 no pattern to catch here
3 16 × 25 400 112 forgetting to shift the second row230 leaving out a partial product
4 158 × 3 474 no pattern to catch here
5 12 × 25 300 210 leaving out a partial product84 forgetting to shift the second row
6 22 × 4 88 no pattern to catch here
7 47 × 9 423 no pattern to catch here
8 29 × 8 232 no pattern to catch here
9 21 × 28 588 210 forgetting to shift the second row408 leaving out a partial product
10 37 × 3 111 no pattern to catch here
11 73 × 45 3285 2815 leaving out a partial product657 forgetting to shift the second row
12 28 × 9 252 no pattern to catch here
13 56 × 15 840 336 forgetting to shift the second row530 leaving out a partial product
14 75 × 11 825 150 forgetting to shift the second row705 leaving out a partial product
15 35 × 3 105 no pattern to catch here
16 83 × 97 8051 1328 forgetting to shift the second row7221 leaving out a partial product
17 57 × 7 399 no pattern to catch here
18 22 × 2 44 no pattern to catch here
19 782 × 2 1564 no pattern to catch here
20 832 × 7 5824 no pattern to catch here

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