Mary has 5 green crayons and 8 blue crayons of different shades. If she gives out 3 green crayons and 1 blue crayon to Becky, how many crayons does she have left?
Let’s work this out in a step by step way to be sure we have the right answer.
9
She had 5 + 8 = 13 crayons to start with.

She gave out 3 + 1 = 4 crayons to Becky.

She will have 13 - 4 = 9 crayons left.

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So, the answer is 9