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WAEC Computer Studies 2019 Paper

Question : 44

Total: 50

Multiply 101

_2

_2

Solution:

Concept:

Binary multiplication follows the same rules as decimal multiplication but uses only the digits

0

and

1

Explanation:

First, convert each binary number to decimal.

101_2 = (1 \times 4) + (0 \times 2) + (1 \times 1) = 5

11_2 = (1 \times 2) + (1 \times 1) = 3

Now multiply the decimal values.

5 \times 3 = 15

Convert

15

back to binary.

15 = 8 + 4 + 2 + 1 = 1111_2

Thus,

101_2 \times 11_2 = 1111_2

Answer:

1111_2

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