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Question 1

Complete these additions and subtractions mentally.

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.
g check answer for question 1g.
h check answer for question 1h.
i check answer for question 1i.
j check answer for question 1j.
k check answer for question 1k.

Question 2

Rearrange these additions to make the mental calculation easier.

a check answer for question 2a.
b check answer for question 2b.
c check answer for question 2c.

Question 3

Use the make up to ten strategy to calculate these.

a check answer for question 3a.
b check answer for question 3b.
c check answer for question 3c.

Question 4

Add from the left to mentally calculate these additions.

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

Question 5

Use the compensation method (add more than you need to one number, and then subtract the extra bit) to calculate these additions.

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

Question 6

Subtract a bit at a time to calculate these mentally.

a check answer for question 6a.
b check answer for question 6b.
c check answer for question 6c.

Question 7

Build up to the larger number and keep track of what is added to calculate the difference.

a check answer for question 7a.
b check answer for question 7b.
c check answer for question 7c.

Question 8

Add the same to both numbers to calculate these subtractions.

a check answer for question 8a.
b check answer for question 8b.
c check answer for question 8c.