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WAEC Computer Studies 2015 Paper

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Question : 46

Total: 49

9

_{10}

is equivalent to X

_8

, where X is?

7.
10.
11.
12.

Solution:

Concept:

Convert a decimal number into its base‑8 equivalent.

Explanation:

9_{10}

represents the decimal number

9

.

To convert to base

8

, divide

9

by

8

.

9 \div 8 = 1

with remainder

1

.

The quotient

1

gives the first (leftmost) digit.

The remainder

1

gives the second digit.

Hence,

9_{10} = 11_8

.

Comparing with

X_8

, we get

X = 11

.

Answer:

C.

11

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