Find the GCF of 24 and 40

Find the GCF of 12 and 56

Find the GCF of 20 and 45

Find the GCF of 32 and 90

Find the GCF of 45,75, and 120

Find the LCM of 4 and 6

Find the LCM of 16 and 20

Find the LCM of 24 and 90

Find the LCM of 4,15, and 18

Find the LCM of 30,50, and 75

A traffic light changes every 30 seconds. Another traffic light changes every 40 seconds. Both lights just changed. After how many minutes will both lights change at the same time again?

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