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Maths MCQ

HCF and LCM · Maharashtra Board STD 7 (MSBSHSE - Semi English Medium). 2 questions.

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2 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The HCF of this pair of numbers is not 1.
  • A
    13,17
  • B
    29,20
  • ✓
    40,20
  • D
    14,15
Answer
Correct option: C.
40,20
40,20

Hint:
40 = 2 x 2 x 2 x 5
20 = 2 x 2 x 5
∴ HCF of 40 and 20 = 2 x 5 = 10

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MCQ 21 Mark
Choose the right option.
The HCF of 120 and 150 is __
  • ✓
    30
  • B
    45
  • C
    20
  • D
    120
Answer
Correct option: A.
30
30

Hint:
120 = 2 x 2 x 2 x 3 x 5
150 = 2 x 3 x 5 x 5
∴ HCF of 120 and 150 = 2 x 3 x 5 = 30

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