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Multiplying by 10
As we'll see in this tutorial, multiplying a multiple of 10--like 10, 20, 30, 40, etc.--by a single digit number is not too much more complicated.
Common Core Standard: 3.NBT.A.3
Decompose multiples of ten to multiply.
Multiply a 1-digit number by a multiple of 10.
Solve word problems with multiples of ten. Decompose multiples of ten to multiply.