Asked by christon

write the missing numbers to.make the sentence true example 7+9=_______+7?
Answered by Damon
make a guess and I will come back and look
Answered by Damon
if 7 cows + 9 cows fill a field
then
9 cows + how many cows
fill the field?
Answered by Damon
ah, here we go:

http://coolmath.com/prealgebra/06-properties/01-properties-commutative-addition-01.htm
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