Estimate the sum.

(21 x 3) + 69 + 10

[2 marks]

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Solution

Solution:

The required sum is (21 x 3) + 69 + 10

21 can be rounded off as 20
and, 69 can be rounded off as 70

(1 mark)

Thus, the estimated sum will be:
(20 x 3) + 70 + 10
= 60 + 70 + 10
= 140

(1 mark)

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