Multiplying 2 Digit Numbers Using Factors Worksheet - C2, Primary Resources printable pdf download

USING FACTORS TO MULTIPLY 2 DIGIT NUMBERS TOGETHER

A total of 20 = 10 x 2 or 4 x 5

18 x 20 can be solved by multiplying 18 x 2 x 10

18 x 2 = 36

36 x 10 = 360

Therefore 18 x 20 = 360

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Multiply these numbers using factors to help. Remember to first think what the

answer might be (estimation) and use this to help you decide whether your

calculation is correct.

21 x 20 =

………………………………………………………………………………………………………………………..

43 x 20 =

………………………………………………………………………………………………………………………..

28 x 20 = ………………………………………………………………………………………………………………………..

22 x 20 = ………………………………………………………………………………………………………………………..

52 x 20 = ………………………………………………………………………………………………………………………..

73 x 20 = ………………………………………………………………………………………………………………………..

81 x 20 = ………………………………………………………………………………………………………………………..

Use the same formula to solve the following:

25 x 40 = 25 x 4 = 100

100 x 10 = 1000

This could be solved by using factors to split the 4 up as well:

25 x 40 = 25 x 2 x 2 x 10 = 25 x 2 = 50

50 x 2 = 100

100 x 10 = 1000

13 x 40 = ………………………………………………………………………………………………………………………..

18 x 40 = ………………………………………………………………………………………………………………………..

21 x 40 = ………………………………………………………………………………………………………………………..

25 x 40 = ………………………………………………………………………………………………………………………..

Multiplying 2 Digit Numbers Using Factors Worksheet - C2, Primary Resources