Question 1
1 markWhat is the least common multiple (L.C.M.) of 4 and 6?
Primary School · Mathematics
The least common multiple and the highest common factor (L.C.M, H.C.F.) : Practice Questions
5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on The least common multiple and the highest common factor (L.C.M, H.C.F.) .
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Question 2
1 markWhat is the smallest number that is exactly divisible by 8, 12, and 20?
Question 3
1 markTwo light towers flash at different intervals. One flashes every 15 seconds and the other every 25 seconds. If they flash together at 8:00 p.m., at what time will they flash together again for the first time?
Question 4
1 markWhich of the following is a common factor of 12 and 18?
Question 5
1 markUsing short division, find the H.C.F. of 48 and 72.
Question 6
5 marks(a) Find all the common factors of 12 and 18 by listing them.
(b) Based on your answer in part (a), what is the highest common factor (H.C.F.) of 12 and 18?
(c) List the first five multiples of 4 and the first five multiples of 6. What is their least common multiple (L.C.M.)?
Write your answer out first, then check it against the worked solution.
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