Cardinal Math

Multi-digit multiplication · sheet 9 of 30

Answer key

The answer, and what a wrong answer means.

The sheet
#ProblemAnswerIf they wrote…
1 15 × 5 75 no pattern to catch here
2 83 × 38 3154 2424 leaving out a partial product913 forgetting to shift the second row
3 79 × 37 2923 2163 leaving out a partial product790 forgetting to shift the second row
4 22 × 34 748 154 forgetting to shift the second row608 leaving out a partial product
5 284 × 5 1420 no pattern to catch here
6 183 × 6 1098 no pattern to catch here
7 352 × 3 1056 no pattern to catch here
8 95 × 6 570 no pattern to catch here
9 99 × 7 693 no pattern to catch here
10 25 × 51 1275 1005 leaving out a partial product150 forgetting to shift the second row
11 14 × 5 70 no pattern to catch here
12 191 × 8 1528 no pattern to catch here
13 36 × 28 1008 360 forgetting to shift the second row648 leaving out a partial product
14 38 × 64 2432 1832 leaving out a partial product380 forgetting to shift the second row
15 44 × 22 968 176 forgetting to shift the second row808 leaving out a partial product
16 32 × 53 1696 1506 leaving out a partial product256 forgetting to shift the second row
17 52 × 5 260 no pattern to catch here
18 32 × 4 128 no pattern to catch here
19 17 × 6 102 no pattern to catch here
20 45 × 9 405 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