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Timeline

Binary code is the language that computers use to store and process information.
Letters and characters are changed into binary using special codes like ASCII (American Standard
Code for Information Interchange).
A number system is a systematic way of representing numbers in terms of quantities.
The decimal number system consists of ten digits from 0 to 9.
The binary number system consists of two digits, 0s and 1s.
To convert decimal to binary, divide the decimal number by 2, record the remainders, and read from
bottom to top for the binary equivalent.
To convert binary to decimal, multiply each binary digit by powers of 2 and sum the results to get the
decimal value.

Choose the correct option.

1. Which two digits make up the binary code?
a. 0 and 2 b. 1 and 2

c. 0 and 1 d. 1 and 3
2. Which term refers to the total number of digits used in a number system?

a. Base b. Place value
c. Position value d. Decimal

3. Which decimal number does the binary number 1011 represent?
a. 11 b. 13

c. 10 d. 15

4. Which base is used in the decimal number system?
a. Base 8 b. Base 10
c. Base 2 d. Base 16

5. Which of these binary numbers represents the decimal number 65?
a. 1100101 b. 1001111

c. 1111101 d. 1000001

Tick ( ) the correct statements and cross ( ) the wrong ones.

1. The word 'binary' comes from the word 'bi', meaning two.

2. A computer uses binary code to represent all types of data.

3. The Most Significant Digit (MSD) is always the left-most digit in a number.

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