Short Quiz

Question 1 of 5

A number \(k\) satisfies \(HCF(84,k)=12\) and \(LCM(84,k)=420\). What is \(k\)?

A 60 B 48 C 72 D 120

Select one option. Answers are shown after the test.

Question 2 of 5

Which pair is co-prime?

A 21 and 35 B 18 and 27 C 22 and 44 D 14 and 25

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Question 3 of 5

Which is the complete prime factorisation of 180?

A \(2^2\times3^2\times5\) B \(2\times90\) C \(2^2\times45\) D \(3^2\times20\)

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Question 4 of 5

What is the smallest number divisible by 8, 12 and 15?

A 60 B 180 C 120 D 240

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Question 5 of 5

Two numbers have HCF 12 and LCM 180. One number is 36. What is the other number?

A 48 B 72 C 60 D 90

Select one option. Answers are shown after the test.

Class 6