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ISEE Upper Level Math : How to find the least common multiple

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Example Questions

Example Question #1 : How To Find The Least Common Multiple

30 is the least common mutiple of 10 and which of these numbers?

Possible Answers:

Correct answer:

Explanation:

9, 12, and 20 can be eliminated immediately, since none of these have 30 as a multiple [30 divided by any of them yields a remainder].

LCM(5,10) = 10 since 10 is a multiple of 5, so 5 can be eliminated.

The set of multiples of 10 is $\left \{ 10,20,\underline{30},40,50...\right \}$ and the set of multiples of 15 is $\left \{ 15, \underline{30}, 45, 60,...\right \}$ ; since 30 is the smallest number that appears on both lists, LCM (10,15) = 30 .

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Example Question #2 : Least Common Multiple

What is the least common multiple of 16 and 20?

Possible Answers:

160

120

Correct answer:

Explanation:

$\textrm{LCM }(16,20)$ is the lowest number that is a multiple of both 16 and 20, so we see which is the first number that appears in both lists of multiples.

The multiples of 16:

$\left \{ 16, 32, 48, 64, \underline{80}, 96, 112,...\right \}$

The multiples of 20:

$\left \{ 20, 40, 60, \underline{80}, 100, 120,...\right \}$

$\textrm{LCM }(16,20) = 80$

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Example Question #3 : Least Common Multiple

Which of the following is the least common multiple of 6, 9, and 12?

Possible Answers:

648

Correct answer:

Explanation:

The least common multiple is the smallest number in value that is a multiple of all three of the numbers. The best way to find the least common multiple (LCM) is to make a quick list of the first few multiples of each number, and then identify the smallest number that is common to all three lists.

Multiples are numbers that you get when multiplying the original number by other numbers.

6: 6, 12, 18, 24, 30, 36

9: 9, 18, 27, 36, 45, 54

12: 12, 24, 36, 48, 60, 72

18 is an answer choice that is common to both 6 and 9, but it is not also a multiple of 12, so it is not correct.

The smallest value that is a common multiple of all three is 36, so this is the LCM.

While 648 is a multiple of all three numbers, it is not the least common multiple of the three numbers.

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Example Question #3 : How To Find The Least Common Multiple

$\frac{3}{5} + \frac{4}{7} - \frac{1}{3}=$

Possible Answers:

123/105

2/3

1/5

88/105

158/105

Correct answer:

88/105

Explanation:

This equation should be solved from left to right, finding the least common denominator for each pair. First we find the least common denominator of 3/5 and 4/7 , which is . The fractions then become 21/35 and 20/35 . 1/3 is then subtracted from that sum:

3/5 + 4/7 - 1/3=21/35+20/35-1/3=63/105+60/105-35/105=88/105

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Example Question #4 : Least Common Multiple

What is the least common multiple of and ?

Possible Answers:

Correct answer:

Explanation:

Find all of the factors of both 9 and 6:

$9=3\times3$

$6=2\times3$

Eliminate all factors that 9 and 6 have in common, in this instance 3 (only eliminate the repeated instance). Multiply all factors that are not in common:

$LCM=3\times2\times3=18$

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Example Question #5 : Least Common Multiple

Which of the following values of makes this statement true?

LCM (N,15) = N

Possible Answers:

N = 375

N = 250

N = 950

N = 655

N = 425

Correct answer:

N = 375

Explanation:

For LCM (N,15) = N to be a true statement, must be a multiple of 15.

$250 \div 15 = 16 \textrm{ R }10$

$375 \div 15= 25$

$425 \div 15 = 28 \textrm{ R }5$

$655 \div 15 = 43 \textrm{ R }10$

$950 \div 15 = 63 \textrm{ R } 5$

Only 375 yields no remainder when divided by 15.

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Example Question #4 : How To Find The Least Common Multiple

Which of the following values of makes this statement true?

LCM (N,20) = N

Possible Answers:

All answer choices are correct.

N=160

N=440

N=720

N=320

Correct answer:

All answer choices are correct.

Explanation:

For LCM (N,20) = N to be a true statement, must be a multiple of . Each of the four values given is divisible by , as seen below:

$160 \div 20 = 8$

$320 \div 20= 16$

$440 \div 20 = 22$

$720 \div 20= 36$

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Example Question #2 : How To Find The Least Common Multiple

Which of the following values of makes this statement false?

LCM (N,20) = 20

Possible Answers:

N = 5

N = 2

N = 10

N = 4

N = 8

Correct answer:

N = 8

Explanation:

For LCM (N,20) = 20 to be true, must be a factor of . Of the five choices, all are factors of except for . This is the correct choice.

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Example Question #8 : How To Find The Least Common Multiple

What is the least common multiple of 15 and 18?

Possible Answers:

270

Correct answer:

Explanation:

To find the least common multiple, you need to determine the multiple that both numbers share that is of the least value. List the multiples of each number and identify the first number (least value) that is in both lists:

15: 15, 30, 45, 60, 75, 90

18: 18, 36, 54, 72, 90

The LCM of 15 and 18 is 90 since it is the first number that shows up in both lists.

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Example Question #9 : How To Find The Least Common Multiple

What is the least common multiple of 4, 12, and 16?

Possible Answers:

768

Correct answer:

Explanation:

To find the least common multiple, you need to determine the multiple that all three numbers share that is of the least value. List the multiples of each number and identify the first number (least value) that is in both lists:

4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48

12: 12, 24, 36, 48

16: 16, 32, 48

The LCM of 4, 12, and 16 is 48 since it is the first number that shows up in all three lists.

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All ISEE Upper Level Math Resources

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ISEE Upper Level Math : How to find the least common multiple

Study concepts, example questions & explanations for ISEE Upper Level Math

All ISEE Upper Level Math Resources

Example Questions

Example Question #1 : How To Find The Least Common Multiple

Example Question #2 : Least Common Multiple

Example Question #3 : Least Common Multiple

Example Question #3 : How To Find The Least Common Multiple

Example Question #4 : Least Common Multiple

Example Question #5 : Least Common Multiple

Example Question #4 : How To Find The Least Common Multiple

Example Question #2 : How To Find The Least Common Multiple

Example Question #8 : How To Find The Least Common Multiple

Example Question #9 : How To Find The Least Common Multiple

All ISEE Upper Level Math Resources

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