Question

Dave collect rocks. he makes 12 groups of 10 rocks and has none left over. Hove many rocks does Dave have?

Answer 1

you multiply the number of groups dave has by the number of rocks in each group.

12*10= 120 rocks
therefor dave has a total of 120 rocks

Answer 2

He makes 12 groups of 10, so you have to multiply 12 by 10, and you get 120 rocks. If you still don't get it, maybe this will help:

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I did 12 groups of "rocks" and if you count them, you get 120.