Question 1(a)

Find the sum by suitable rearrangement:
837 + 208 + 363

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Solution

We can arrange the calculation in such a way that it becomes easy and quick to find the answer.

837 + 208 + 363 can be represented as :

= (837 + 363) + 208.

We club 837 and 363 as the last digits of each number i.e 7 and 3 respectively add up to 10. So the last digit of their sum will be 0. This will be easier to compute the entire sum as:

= 1200 + 208

= 1408

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837 + 208 + 363

Question 1(b)

Find the sum by suitable rearrangement:
1962 + 453 + 1538 + 647

\frac{4}{7} + (\frac{- 4}{9}) + \frac{3}{7} + (\frac{- 13}{9})

- 5 + \frac{7}{10} + \frac{3}{7} + (- 3) + \frac{5}{14} + (\frac{- 4}{5})

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