6th Grade · The Number System
Least Common Multiple
6.NS.B.4
Definition
The smallest multiple that two or more numbers have in common.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- Multiples of 4: 4,8,12,16,20. Multiples of 6: 6,12,18,24. Common multiples: 12, 24 — least is 12.
- LCM is used to find a common denominator.
Key rule
The LCM is the smallest number that both original numbers divide into evenly.
Memory hook
Smallest number they both multiply into.