5th Grade · Number & Operations in Base Ten
Add & Subtract Decimals
5.NBT.B.7
Definition
To combine or take away decimals by lining up the decimal points and place values.
Examples
- 3.25 + 1.40 = 4.65.
- 5.80 - 2.35 = 3.45.
Key rule
Line up the decimal points so each place value matches before adding or subtracting.
Memory hook
Line up the dots before you add or take away.