Before continuing with multiplication it might be wise to review place value.
Quick Place Value Review
Because we use a Base-10 number system, multiplying by 10 or 100 (or any multiple of 10) is fairly easy.
As the picture below shows, each place has a value 10 times that of the place immediately to the right
If necessary, review place value before proceeding with the multiplication methods below.
Multiplying an Integer by 10
|Multiply integers by 10 by moving the digits one place to the left and adding one zero.
043 x 10
Multiplying an Integer by 100
|Multiply integers by 100 by moving the digits two places to the left and adding two zeros.
Quick Way: count the zeros and put them to right of the integer being multiplied.
e.g. 34 x 100 = 3400
Caution: Highlight to your children that multiplying by 10 or 100 can be more than just adding zeros as this can lead to problems when multiplying decimals. e.g. where calculating 1.4 x 10 = 1.40 could incorrectly result. Stress the change in place value of each numeral as it moves to the left.
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