Cardinal Math

Multi-digit multiplication · sheet 18 of 30

Answer key

The answer, and what a wrong answer means.

The sheet
#ProblemAnswerIf they wrote…
1 35 × 13 455 140 forgetting to shift the second row315 leaving out a partial product
2 91 × 38 3458 1001 forgetting to shift the second row2708 leaving out a partial product
3 16 × 2 32 no pattern to catch here
4 83 × 29 2407 1627 leaving out a partial product913 forgetting to shift the second row
5 39 × 84 3276 2436 leaving out a partial product468 forgetting to shift the second row
6 68 × 5 340 no pattern to catch here
7 29 × 6 174 no pattern to catch here
8 73 × 87 6351 1095 forgetting to shift the second row5621 leaving out a partial product
9 43 × 3 129 no pattern to catch here
10 64 × 86 5504 4824 leaving out a partial product896 forgetting to shift the second row
11 82 × 71 5822 5602 leaving out a partial product656 forgetting to shift the second row
12 589 × 7 4123 no pattern to catch here
13 18 × 4 72 no pattern to catch here
14 159 × 4 636 no pattern to catch here
15 556 × 6 3336 no pattern to catch here
16 375 × 9 3375 no pattern to catch here
17 81 × 6 486 no pattern to catch here
18 69 × 9 621 no pattern to catch here
19 22 × 88 1936 1616 leaving out a partial product352 forgetting to shift the second row
20 55 × 2 110 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