# 4.3.5. Common Multiples and Lowest Common Multiple (L.C.M.)

Find the L.C.M of 6, 15, and 40.

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Find the L.C.M of the numbers and .

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Determine the multiples of the number 5 up to 60.

• A
• B
• C
• D
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Find all the common multiples of the numbers 10 and 9 up to 450.

• A
• B
• C
• D
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Determine all the common multiples of the numbers 2, 4, and 9 up to 72.

• A72
• B
• C
• D
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Which of the following may be the two numbers whose common multiple is 24?

• A6 and 11
• B7 and 17
• C5 and 2
• D2 and 12
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Determine the least common multiple of two numbers, given that the prime factors of the first one are 3, 3, 7, and 7, and the prime factors of the second one are 3, 3, 7, and 11.

• A891
• B
1 617
• C
4 851
• D
3 773
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A florist waters one of his plants every 48 days and waters another one every 40 days. If he watered both plants today, after how many days will he water the two plants in the same day?

• A after 240 days
• B after 80 days
• C after 88 days
• D after
1 912
days
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If the LCM of two numbers is 44, and their HCF is 2. What are the possible two numbers?

• A4, 22
• B26, 18
• C26, 22
• D4, 18
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Complete the table below.

First Number 82 Second Number Their Highest Common Factor Their Lowest Common Multiple 69 3 2 070 2 2 788

• A90, 68
• B159, 68
• C90, 150
• D159, 150
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Find the smallest 3-digit common multiple of 6 and 12.

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Determine all the multiples of 3 that do not have the digit 3 and are less than 27.

• A
• B
• C
• D
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Determine the greatest multiple of 5 that is formed of 6 digits.

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