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The octal fraction 0.65 converts to binary as 

Computer Studies
WAEC 2022

The octal fraction 0.65 converts to binary as 

  • A. 0.110011
  • B. 0.110101
  • C. 101101
  • D. 101101
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Correct Answer: Option B
Explanation

\(0.65_8 = 0 + 6 \times 8^{-1} + 5 \times 8^{-2}\)

            = 0 + \(\frac{6}{8} + \frac{5}{64}\) = 0.828125 base 10

0.828125 base 10 to base 2

0.828125 X 2 = 1.65625 1
0.65625 X 2 = 1.3125 1
0.3125 X 2 = 0.625  0
0.625 X 2 = 1.25 1
0.25 X 2 = 0.5  0
0.5 X 2 = 1.0 1

read answer from up to down

0.828125 in base 10 = 0.110101 in base 2.

Therefore, 0.65 in base 8 = 0.110101 in base 2.


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts