Multiplying by 10 and by 100

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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

247 using number blocks

If necessary, review place value before proceeding with the multiplication methods below.

Multiplying by 10

Multiply by 10 by moving the digits one place to the left and adding one zero.
    H T O        
      4 3 x 1 0  
  = 4 3 0        

Multiplying by 100

Multiply by 100 by moving the digits two places to the left and adding two zeros.
  T H T O        
      5 9 x 1 0 0
= 5 9 0 0        

Quick Way: count the zeros and put them to right of the number being multiplied.
e.g. 34 x 100 = 3400

Try this multiplication worksheet generator. You can select to multiply by multiples of 10 or multiples of 100 and get limitless questions to print out and practice with.


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