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Numbers: Multiples, Primes, LCM & HCF

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Numbers: Multiples, Primes, LCM & HCF

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Quiz on multiples, primes, LCM, HCF

Created by

Olayiwola Khadijat olawunmi
Olayiwola Khadijat olawunmi
Nigeria

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Numbers: Multiples, Primes, LCM & HCF
 

Numbers: Multiples, Primes, LCM & HCFOnline version

Quiz on multiples, primes, LCM, HCF

by Olayiwola Khadijat olawunmi
1

What is the smallest number that is a multiple of 2, 5, and 10?

2

Is 7 a prime number?

3

Find the LCM of 6 and 15.

4

Find the HCF (GCD) of 18 and 24.

5

Which number is a multiple of 2 but not 5?

6

Which is a prime number greater than 10?

7

LCM of 8 and 12?

8

HCF of 14 and 21?

9

Which of the following is a multiple of 10?

10

LCM of 9 and 12?

Feedback

Correct. The LCM of 2, 5, and 10 is 10.

Right. 7 has no divisors other than 1 and itself.

Correct. Prime factors: 6=2×3, 15=3×5 so LCM=2×3×5=30.

Nice. Common factors are 1,2,3,6; greatest is 6.

Correct. 6 is divisible by 2 but not by 5.

Correct. 11 has no divisors other than 1 and 11.

Correct. 8=2^3, 12=2^2×3; LCM=2^3×3=24.

Right. Common factors: 1 and 7; greatest is 7.

Correct. 40 ends with 0, a multiple of 10.

Correct. 9=3^2, 12=2^2×3; LCM=2^2×3^2=36.

 
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