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, U grid we notice that Thousands are 100 times bigger than Tens, Hundreds are 100 times bigger than units, Tens are 100 times bigger than tenths etc...
*Note that the U for Units is another term for Ones.
e.g. Work out:
54.6 × 10 = 5460
Here is 54.6 in a Th, H, T, U grid.
Each digit moves two places to the left.
Remember to fill in that 0 in the units column.
So 54.6 × 100 = 5460
Want to understand this further and learn how this links to other topics in maths?
Why not watch this video?