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.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
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.