Multiplying By Multiples of Ten R6-5

Watch Andres' Voki tell you how to solve number one on the homework.


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I will now walk you through solving number two.
42x30
Remember to ignore the zero, we can always put it at the end of the answer.
So this leaves us with
42
x 3

3 times 2 is 6

42
x 3
6

3 times 4 is 12

42
x 3
126

Now we add the zero to the end and ger
1,260 as our answer!