UPSC · CSAT · Basic Numeracy

HCF questions with answers

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Five questions to begin your revision

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01Medium · ✓ Verified answer

UPSC Civil Services CSAT practice check: What is the highest common factor of 20 and 24?

  1. 3
  2. 4
  3. 5
  4. 8
Check answer and explanation +
B — 4

20 = 4 × 5 and 24 = 4 × 6. Since 5 and 6 are coprime, the HCF is 4. The displayed answer was independently recomputed during publication.

Source: NCERT Mathematics Classes VI–X · HCF; mapped to the published UPSC Civil Services CSAT quantitative/numeracy area; answer independently recomputed. Syllabus-aligned practice—not a previous-year question.
02Medium · ✓ Verified answer

UPSC Civil Services CSAT high-priority drill: What is the highest common factor of 25 and 30?

  1. 5
  2. 6
  3. 10
  4. 4
Check answer and explanation +
A — 5

25 = 5 × 5 and 30 = 5 × 6. Since 5 and 6 are coprime, the HCF is 5. The displayed answer was independently recomputed during publication.

Source: NCERT Mathematics Classes VI–X · HCF; mapped to the published UPSC Civil Services CSAT quantitative/numeracy area; answer independently recomputed. Syllabus-aligned practice—not a previous-year question.
03Medium · ✓ Verified answer

UPSC Civil Services CSAT foundation revision: What is the highest common factor of 30 and 36?

  1. 7
  2. 12
  3. 5
  4. 6
Check answer and explanation +
D — 6

30 = 6 × 5 and 36 = 6 × 6. Since 5 and 6 are coprime, the HCF is 6. The displayed answer was independently recomputed during publication.

Source: NCERT Mathematics Classes VI–X · HCF; mapped to the published UPSC Civil Services CSAT quantitative/numeracy area; answer independently recomputed. Syllabus-aligned practice—not a previous-year question.
04Medium · ✓ Verified answer

UPSC Civil Services CSAT speed-building set: What is the highest common factor of 35 and 42?

  1. 14
  2. 6
  3. 7
  4. 8
Check answer and explanation +
C — 7

35 = 7 × 5 and 42 = 7 × 6. Since 5 and 6 are coprime, the HCF is 7. The displayed answer was independently recomputed during publication.

Source: NCERT Mathematics Classes VI–X · HCF; mapped to the published UPSC Civil Services CSAT quantitative/numeracy area; answer independently recomputed. Syllabus-aligned practice—not a previous-year question.
05Medium · ✓ Verified answer

UPSC Civil Services CSAT accuracy checkpoint: What is the highest common factor of 40 and 48?

  1. 7
  2. 8
  3. 9
  4. 16
Check answer and explanation +
B — 8

40 = 8 × 5 and 48 = 8 × 6. Since 5 and 6 are coprime, the HCF is 8. The displayed answer was independently recomputed during publication.

Source: NCERT Mathematics Classes VI–X · HCF; mapped to the published UPSC Civil Services CSAT quantitative/numeracy area; answer independently recomputed. Syllabus-aligned practice—not a previous-year question.
✓

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