
Terri M. answered 09/30/13
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I think this is what you are looking for:
The distributive property is multiplication (or division) over addition (or subtraction).
6*13 = 6*(10+3) = 6*10+6*3 = 60+18 = 78
This rewrites the 13 as 10+3 and clears the parenthesis by multiplying over them. Sometimes you see this as arcs jumping over. Not the most sophisticated explanation, but hope that it helps.