
Mark M. answered 02/03/15
Tutor
5.0
(278)
Mathematics Teacher - NCLB Highly Qualified
Your daughter is correct.
A multiple of 6 is the same as repeatedly adding six: 2 x 6 = 6 + 6, 5 x 6 = 6 + 6 + 6 + 6 + 6
So C. is the same as your daughter's way.
She knows her multiplication tables!

Mark M.
You are welcome!
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