Find the sum by suitable rearrangement:
(a) 837 + 208 + 363 (b) 1962 + 453 + 1538 + 647

a. 837+208+363

We have to rearrange the numbers in such a way that when we add two numbers the units digit should be 0.

Therefore,

837+208+363 = 837 + 363 +208      (As we can see sum of the units digit of 837 and 363 gives 0)

                           = 1200 + 208              (837+363 = 1200)

                           = 1408

b. 1962+453+1538+647 = 1962+1538+453+647                 (2+8 = 10 and 3+7 = 10)

                                              = 3500 + 1100

                                              = 4600.

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Updated on: 10-Oct-2022

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