JAMB Mathematics questions: Number bases

25 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Number bases· JAMB

   Express 100 (base 10) in base 5.

   • A40
   • B400
   • C1000
   • D200

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2. Question 22· Number bases· JAMB

   If 23 (base x) = 11 (base 10), find x.

   • A4
   • B3
   • C5
   • D6

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   Explanation and discussion

3. Question 23· Number bases· JAMB

   Find x if 132ₓ = 42 (base ten).

   • A4
   • B5
   • C6
   • D8

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4. Question 24· Number bases· JAMB

   Convert 0.75 (base 10) to base 2.

   • A0.011
   • B0.101
   • C0.11
   • D0.111

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   Explanation and discussion

5. Question 25· Number bases· JAMB

   Convert 432 (base 5) to base 10.

   • A117
   • B127
   • C107
   • D432

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   Explanation and discussion