GCD and LCM Fundamentals Basics

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1) The GCD of 18 and 24 is:
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GCD And LCM Fundamentals Basics - Quiz

Want to strengthen your skills with factors and multiples? In this quiz, you’ll practice finding the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of different numbers. You’ll explore prime factorizations, test for coprime pairs, and even solve real-world cycle problems like bells ringing or trains arriving. Take this... see morequiz to build a solid foundation in GCD and LCM! see less

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2) The LCM of 6 and 8 is:
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3) Which is the prime factorization of 60?
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4) The GCD of 45 and 60 is:
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5) LCM(12, 15) = ?
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6) Which pair is coprime?
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7) GCD(36, 84) is:
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8) LCM(9, 12) is:
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9) A teacher arranges chairs in rows of 12 or 18. Least number of chairs possible?
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10) Which of these equals LCM(20, 30)?
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11) GCD(72, 90) = ?
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12) A bell rings every 15 minutes, another every 20 minutes. After how many minutes together?
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13) GCD(28, 49) = ?
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14) LCM(14, 21) = ?
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15) GCD(120, 150) = ?
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16) Two trains whistle every 12 and 18 minutes. After how many minutes together?
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17) If GCD(a, b) = 1, then a and b are:
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18) GCD(63, 81) = ?
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19) LCM(16, 24) = ?
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20) GCD(144, 192) = ?
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The GCD of 18 and 24 is:
The LCM of 6 and 8 is:
Which is the prime factorization of 60?
The GCD of 45 and 60 is:
LCM(12, 15) = ?
Which pair is coprime?
GCD(36, 84) is:
LCM(9, 12) is:
A teacher arranges chairs in rows of 12 or 18. Least number of chairs...
Which of these equals LCM(20, 30)?
GCD(72, 90) = ?
A bell rings every 15 minutes, another every 20 minutes. After how...
GCD(28, 49) = ?
LCM(14, 21) = ?
GCD(120, 150) = ?
Two trains whistle every 12 and 18 minutes. After how many minutes...
If GCD(a, b) = 1, then a and b are:
GCD(63, 81) = ?
LCM(16, 24) = ?
GCD(144, 192) = ?
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