5th Grade · Number & Operations in Base Ten
Multiply Decimals
5.NBT.B.7
Definition
To find the product by multiplying digits as whole numbers, then placing the decimal by counting decimal places.
Examples
- 0.4 x 0.3 = 0.12 (1 + 1 = 2 decimal places).
- 1.2 x 0.5 = 0.60.
Key rule
Multiply as whole numbers, then count the total decimal places for the product.
Memory hook
Multiply first, place the decimal last.