Using the most convenient combinations ,find the sum of the following
$43 + 159 + 267 + 38 + 31$

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Solution

Finding sum using most convenient combinations.
We have $43 + 159 + 267 + 38 + 31$ $= 43 + (267 + 159) + (31 + 38)$ (Using commutative property)
$= (43 + 267) + (159 + 31) + 38$ (Using associative property)
$= (310 + 190) + 38 = 500 + 38 = 538$
Thus $43 + 159 + 267 + 38 + 31$ is $538$ .

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