Fixit Maths

Learning from Mistakes

Multiplying by 1 or 2 digits with decimals

The understanding tested and common errors are noted for each question, with a link provided to relevant support material. Answers for each part of a long multiplication calculation are shown.

Always check the digits in the question have been copied correctly.

Mistakes with multiplication facts may be common. A multiplication square can be used by the pupil, to rule these out and focus on the method.

1) 3023 x 3 = 9069

Calculating with zero .

2) 1,501 x 5 = 7505

Calculating with zero , carrying digits .

3) 6 x 3746 = 22476

Carrying digits , commutativity .

4) 32 x 23 = 96 640 736

Long multiplication .

5) 225 x 41 = 225 9000 9225

Long multiplication , recording zero after a placeholder , carrying digits .

6) 32 x 2030 = 4060 60900 64960

Long multiplication , commutativity , calculating with zero , recording zero after a placeholder.

7) 2376 x 67 = 16632 142560 159192

Long multiplication , carrying digits .

8) 2.4 x 6 = 14.4

Multiplying a decimal , carrying digits .

9) 3 x 2.13 = 6.39

Multiplying a decimal , commutativity .

10) 6.45 x 8 = 51.6

Multiplying a decimal , carrying digits .

Understanding Tested

Question Numbers

Calculating with zero
1, 2, 6
Carrying digits
2, 3, 5, 7, 8, 10
Commutativity
3, 6, 9
Long multiplication
4, 5, 6, 7
Recording zero after a placeholder
5, 6
Multiplying a decimal
8, 9, 10

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