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Pre-Algebra—Least Common Multiple—Have It
DO NOT WRITE ON THIS SHEET!!
1. Find the LCM.
a. 12x and 15xy
b. 25y² and 15x
c. 12x and 40
d. 8x and 25y
e. 6a³ and 8a
f. 16a, 18ab, 21a²
2. If 2 #s are prime, what is their LCM. Give two
examples.
3. The LCM of 2 consecutive #s is greater than 200
and is a multiple of 7. Name the #s.
4. 2 #s have an LCM of 2² • 3 • 5. Their GCF is 2 • 5.
If one of the numbers is 2 • 3 • 5, what is the other
number?
5. Find all the pairs of #s that satisfy the conditions.
a. 2 prime #s whose LCM is 35.
b. 2 composite #s whose LCM is 16.
c. 2 square #s whose LCM is 36.
d. 2 even #s whose LCM is 12
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