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GCSE Edexcel Computer Science 9-1 > Data > Flashcards

Flashcards in Data Deck (7)
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1
Q

What is denary?

A

Denary is a number system that uses 10 symbols to represent each digit. The symbols range from 0-9.

2
Q

What is binary?

A

Binary is a number system that uses two symbols for each digit. Only 0 and 1 are used in binary.

3
Q

What is hexadecimal?

A

Hexadecimal is a system that uses 16 different symbols. It uses the digits 0-9 and then A-F.

4
Q

What are the methods used to express negative numbers in binary?

A

Sign and magnitude along with two’s compliment.

5
Q

What is sign and magnitude?

A

The most significant bit (MSB) of the binary number is a designated sign bit. If the number is positive then the MSB is set to 0. If the number is negative then the MSB is set to 1.

6
Q

What is two’s compliment?

A

The place value of the MSB is made negative. This allows us to express negative numbers by subtracting the largest possible place value, and then adding the difference back on.

7
Q

How does binary addition work?

A

0 + 0 = 0, 1 + 0 or 0 + 1 = 1. However, 1 + 1 = 0 as we can’t use the symbol 2 in binary, so we carry the 1 and put 0 in the current place.