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Question 1 of 6
hard
The GCF of two numbers is 6 and their LCM is 72. One number is 18. Find the other.
Explanation: a×b=GCF×LCM, 18×b=6×72=432, b=432÷18=24
Question 2 of 6
hard
Find the smallest number divisible by 4, 5, and 6.
Explanation: LCM(4,5,6)=60
Question 3 of 6
hard
Prime factorization of 504 is?
Explanation: 504÷8=63, 63=9×7=3²×7, so 2³×3²×7
Question 4 of 6
hard
The product of two numbers is 240. Their GCF is 4. What is their LCM?
Explanation: GCF×LCM=a×b, 4×LCM=240, LCM=60
Question 5 of 6
hard
Find the largest number that divides 48 and 64 exactly.
Explanation: GCF(48,64)=16
Question 6 of 6
hard
Three lights flash every 6, 8, and 12 seconds. They flash together at 12:00. When next?
Explanation: LCM(6,8,12)=24 seconds = 12:00:24
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