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Questions

Complete these exercises using the mental strategies you have learned. Using a calculator will not help you develop these skills.

Question 1

Multiply these numbers by 9 by multiplying by 10 and taking one of the number away.

a check answer for question 1a.
b check answer for question 1b.
c check answer for question 1c.
d check answer for question 1d.
e check answer for question 1e.
f check answer for question 1f.

Question 2

Multiply these numbers by 11 by multiplying by 10 and adding one of the number.

a check answer for question 2a.
b check answer for question 2b.
c check answer for question 2c.
d check answer for question 2d.
e check answer for question 2e.
f check answer for question 2f.

Question 3

Multiply these numbers by 5. Choose the best multiplying by 5 strategy.

a check answer for question 3a.
b check answer for question 3b.
c check answer for question 3c.
d check answer for question 3d.
e check answer for question 3e.
f check answer for question 3f.

Question 4

Multiply these numbers by 6 by multiplying by 2 and then by 3 or vice versa.

a check answer for question 4a.
b check answer for question 4b.
c check answer for question 4c.
d check answer for question 4d.

Question 5

Halve and double to solve these multiplications.

a check answer for question 5a.
b check answer for question 5b.
c check answer for question 5c.
d check answer for question 5d.