Paper 1 · ICT
Which of the following represents the binary equivalent of the decimal number 23?
A01011
B10111 ✓ Correct
C10011
DNone of the above
Correct answer: (B) 10111 — The binary of 23 is 10111, so that is the answer.
Explanation
★The binary of 23 is 10111, so that is the answer.
★The number 23 is made of 16 plus 4 plus 2 plus 1.
★The place values used are 16, 8, 4, 2 and 1.
★Putting ones at 16, 4, 2 and 1 and zero at 8 gives 10111.
★A check confirms 16 plus 4 plus 2 plus 1 equals 23.
★So the binary equivalent of 23 is 10111.
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