Cardinal Math

Multi-digit multiplication · sheet 30 of 30

Answer key

The answer, and what a wrong answer means.

The sheet
#ProblemAnswerIf they wrote…
1 13 × 3 39 no pattern to catch here
2 21 × 8 168 no pattern to catch here
3 325 × 2 650 no pattern to catch here
4 19 × 3 57 no pattern to catch here
5 23 × 88 2024 1624 leaving out a partial product368 forgetting to shift the second row
6 99 × 66 6534 1188 forgetting to shift the second row5454 leaving out a partial product
7 649 × 6 3894 no pattern to catch here
8 52 × 71 3692 3502 leaving out a partial product416 forgetting to shift the second row
9 61 × 44 2684 2404 leaving out a partial product488 forgetting to shift the second row
10 15 × 57 855 180 forgetting to shift the second row535 leaving out a partial product
11 17 × 3 51 no pattern to catch here
12 42 × 5 210 no pattern to catch here
13 741 × 9 6669 no pattern to catch here
14 734 × 8 5872 no pattern to catch here
15 36 × 4 144 no pattern to catch here
16 28 × 23 644 140 forgetting to shift the second row424 leaving out a partial product
17 82 × 3 246 no pattern to catch here
18 25 × 6 150 no pattern to catch here
19 78 × 42 3276 2816 leaving out a partial product468 forgetting to shift the second row
20 35 × 71 2485 2105 leaving out a partial product280 forgetting to shift the second row

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