When we multiply numbers by 100, we do not simply add 00 to the end.

When the numbers are decimals, this rule does not work.

54.6 × 100 does not equal 54.600

When we multiply numbers by 100, each digit must move two places to the left.  

When we look at the columns in a Th, H, T, O grid we notice that thousands are 100 times bigger than tens, hundreds are 100 times bigger than ones, tens are 100 times bigger than tenths etc...

Example

What is 54.6 x 100?

Here is 54.6 in a decimal place value grid.

Answer

Each digit moves two places to the left.

Remember to fill in that 0 in the ones column.

So 54.6 x 100 = 5,460  

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