Skills · The Number System · Factors & Multiples
Least common multiple
Printable practice with an answer key the engine computes, at three levels, in as many versions as you need.
Problem types
- two numbers up to 12: LCM of 6 and 8
- one number divides the other: LCM of 4 and 12
- two numbers up to 30: LCM of 12 and 18
- three numbers: LCM of 4, 6 and 9
- a story: when do they meet again?: Bells ring every 6 and 8 minutes, both now. Both ring again in?
Sample Sheet · Level 1
- LCM of 4 and 8 =
- LCM of 2 and 10 =
- LCM of 2 and 6 =
- LCM of 4 and 6 =
- LCM of 7 and 12 =
- LCM of 3 and 11 =
- LCM of 3 and 9 =
- LCM of 8 and 10 =
Answer key
- 8
- 10
- 6
- 12
- 84
- 33
- 9
- 40
Sample Sheet · Level 3
- LCM of 8, 5 and 4 =
- Buses go every 8 and 12 minutes, both now. Both go again in?
- Timers beep every 5 and 9 minutes. Both beep now. Again in?
- Trains go every 4 and 9 minutes, both now. Together again in?
- Lights flash every 4 and 6 minutes, both now. Next together in?
- LCM of 6, 3 and 10 =
- LCM of 7, 3 and 4 =
- LCM of 10, 5 and 14 =
Answer key
- 40
- 24
- 45
- 36
- 12
- 30
- 84
- 70
Make your own
Pick the count, the level and the version, and print it with work space and the key on its own page. The same skill also makes an I Do, We Do, You Do lesson, a Mosaic, a Decoder and more.