Multiplying by 10 and by 100
Before continuing with multiplication it might
be wise to review place value.
Quick Place Value Review
Because we use a Base10 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 by 10
Multiply by 10 by moving the
numbers
one place to the left and adding one zero. 

Multiplying by 100
Multiply by 100 by moving the
numbers
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.
Look at the fractions section for help with how
to multiply fractions or the decimals
section for guidance on multiplying decimals.