por Anquineik Mitchell 8 anos atrás
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por Alissa J.
por Alesha Teitelbaum
por Mackenzie DuVall
por Natasha Farley
Drawing a picture of an object and group it by the number you are multiplying.
It's counting by 5's.
Repeated addition is simply adding groups of the same number.
3*4=20
3*5=15