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Question 3

Round each number to the nearest whole number and then estimate the answer for these subtractions:

a 67.8 – 21.9 is approximately equal to: check answer for question 3a.
b 56.28 – 32.89 is approximately equal to: check answer for question 3b.
c 648.95 – 207.19 is approximately equal to: check answer for question 3c.
d 487.7 – 253.27 is approximately equal to: check answer for question 3d.

Question 4

Now, without using a calculator, set out the following calculations to find the subtraction in each case:

a 67.8 – 21.9 = check answer for question 4a.
b 56.28 – 32.89 = check answer for question 4b.
c 648.95 – 207.19 = check answer for question 4c.
d 487.7 – 253.27 = check answer for question 4d.