Activity 2.
Directions: Read the problem carefully.
A buzzer sounds every 15 minutes. Another buzzer sounds every 45 minutes. If both buzzers will sound together at noon, what time they will buzz again together?
5 15 45
3 3 9
1 3
LCM: 5 × 3 × 3 = 45
Therefore, the least number of minutes that the two buzzers buzz together again is in 45 minutes. So, if the buzzers buzz together at noon, they will buzz again at exactly 12:45 noon. ​