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Evaluate \(1011_2 + 122_4\), leaving your answer in base 10.

Computer Studies
JAMB 2023

Evaluate \(1011_2 + 122_4\), leaving your answer in base 10.

  • A. 37
  • B. 51
  • C. 47
  • D. 73
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Correct Answer: Option A
Explanation

1011\(_2\) = 1 × 2\(^3\) + 0 × 2\(^2\) + 1 × 2\(^1\) + 1 × 2\(^0\)
1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 8 + 0 + 2 + 1 = 11
122\(_4\) = 1 × 4\(^2\) + 2 × 4\(^1\) + 2 × 4\(^0\)
1 × 16 + 2 × 4 + 2 × 1 = 16 + 8 + 2 = 26
11 + 26 = 37


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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free