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Find the sum by suitable rearrangement.a. $837+208+363$b. $1962+453+1538+647$
Given :
The given expressions are,
a. $837+208+363$
b. $1962+453+1538+647$.
To do :
We have to find the sum of the given expressions b suitable rearrangement.
Solution :
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)
$= 1200 + 208$ $(837+363 = 1200)$
$= 1408$
Therefore, the sum of $837+208+363$ is 1408.
b. $1962+453+1538+647$
$1962+453+1538+647 = 1962+1538+453+647$ $(2+8 = 10 and 3+7 = 10)$
$= 3500 + 1100$
$= 4600$.
Therefore, the sum of $1962+453+1538+647$ is 4600.