Multiplying by tens

Grade 3 · Level 1 · Sheet 1

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the answers

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1.
4×70=?
2.
3×60=?
3.
4×50=?
4.
2×30=?
5.
3×40=?
6.
3×70=?
7.
2×60=?
8.
3×80=?
9.
2×10=?
10.
5×70=?
11.
5×50=?
12.
4×60=?

Show the answer key

1.280
2.180
3.200
4.60
5.120
6.210
7.120
8.240
9.20
10.350
11.250
12.240

The mistakes behind most wrong answers

A wrong answer in multiplying by tens is rarely random. These are the ones that come up most often, each on a real problem — worth knowing before you mark a sheet, because the fix for each is different.

5×70=?
The answer is 350. A child who answers 75 probably added instead of multiplying.
2×20=?
The answer is 40. A child who answers 42 probably counted one group too many or too few.

In the app, every wrong answer is matched against mistakes like these, and the weekly email tells you which one your child keeps making — in those words, not as a percentage.

Answer key · Multiplying by tens · Level 1 · Sheet 1

The mistakes behind most wrong answers