A toad croaks every 8 seconds. A frog croaks every 6 seconds. They both croak at the same time. After how many seconds will they next both croak at the same time?
The toad and the frog will both croak after 24 seconds.
A red light flashes every 6 seconds. A green light flashes every 15 seconds. A blue light flashes every 21 seconds. They have all flashed at the same time. After how many seconds will they next all flash at the same time?
All the lights will flash after 210 seconds.
The lowest common multiple of two numbers is 70. Both numbers are less than 20. Write down two possible numbers.
LCM of 5 and 14 or LCM of 7 and 10 or LCM of 10 and 14
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