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Elementary Mathematics

Elementary Mathematics Topics

School level (Class 6–12) — Elementary Mathematics

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quiz Questions

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Q11

Find the LCM of 114 and 72.

1 · 2 marks · MCQ

A.

186

B.

6

C.

1368

D.

1383

Explanation

LCM(114,72) = (114×72)/HCF = 1368.

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Q12

Find the HCF (GCD) of 57 and 39.

2 · 2 marks · MCQ

A.

741

B.

5

C.

18

D.

3

Explanation

HCF(57,39) = 3 using prime factorisation / Euclid's algorithm.

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Q13

Find the LCM of 46 and 25.

3 · 2 marks · MCQ

A.

1150

B.

1

C.

1156

D.

71

Explanation

LCM(46,25) = (46×25)/HCF = 1150.

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Q14

Find the HCF (GCD) of 65 and 38.

4 · 2 marks · MCQ

A.

5

B.

2470

C.

27

D.

1

Explanation

HCF(65,38) = 1 using prime factorisation / Euclid's algorithm.

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Q15

Find the LCM of 30 and 111.

5 · 2 marks · MCQ

A.

1110

B.

1123

C.

141

D.

3

Explanation

LCM(30,111) = (30×111)/HCF = 1110.

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Q16

Find the HCF (GCD) of 24 and 97.

1 · 2 marks · MCQ

A.

73

B.

1

C.

2328

D.

7

Explanation

HCF(24,97) = 1 using prime factorisation / Euclid's algorithm.

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Q17

Find the LCM of 57 and 42.

2 · 2 marks · MCQ

A.

810

B.

3

C.

798

D.

99

Explanation

LCM(57,42) = (57×42)/HCF = 798.

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Q18

Find the HCF (GCD) of 42 and 66.

3 · 2 marks · MCQ

A.

462

B.

24

C.

6

D.

9

Explanation

HCF(42,66) = 6 using prime factorisation / Euclid's algorithm.

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Q19

Find the LCM of 30 and 71.

4 · 2 marks · MCQ

A.

1

B.

2136

C.

101

D.

2130

Explanation

LCM(30,71) = (30×71)/HCF = 2130.

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Q20

Find the HCF (GCD) of 49 and 19.

5 · 2 marks · MCQ

A.

4

B.

30

C.

931

D.

1

Explanation

HCF(49,19) = 1 using prime factorisation / Euclid's algorithm.