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?
She had 5+8 = <<5+8=13>>13 crayons to start with
She gave out 3+1 = <<3+1=4>>4 crayons to Becky
She will have 13-4 = <<13-4=9>>9 crayons left
#### 9