Simplify using associative property: $(18 + 59) + 1$

79

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78

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76

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80

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Solution

The correct option is C $78$
$(18 + 59) + 1 = 18 + (59 + 1)$ (associative property)
$= 18 + 60$
$= 78$
(Here, to find the result, we avoided $18 + 59$ , which could be time consuming).

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