Data Representation (AQA A-Level)

Ordinal numbers describe

• the numerical position of items/elements in a sequence

• the ordnance of items/elements in a sequence

• the size of items/elements in a sequence

• the type of items/elements in a sequence

A rational number is

• a number that can be expressed as a ratio or fraction

• a whole number that is not divisible

• a fraction that does not recur

• a number such as π (PI) or √2 (root 2)

An irrational number is

• a number such as π (PI) that has a series of non-repeating numbers

• a number such as π (PI) that has a series of repeating numbers

• a number that can be shown as a ratio or fraction

• A whole number from zero to infinity that can be expressed as a set

A number base can be defined as

• The number of different digits/combination of digits and letters that a system of counting uses to represent numbers

• The values of base n+1 used to support the system of counting that represent numbers

• The number of the base represents the maximum digit that any one unit can contain

• The number of various digits and letters that a system of ordinal counting uses to represent the various bases

Convert 10011001 in binary to decimal

• 153

• 151

• 149

• 155

Convert 01110010 in binary to decimal

• 114

• 112

• 108

• 116

Convert 6134 to binary

• 1011111110110

• 1011101110110

• 1011011110110

• 1011111110010

Convert 1010101111001101 to hexadecimal

• ABCD

• AB4D

• BADC

• ABCE

What is the name for 2²⁰ (2 to the power of 20)

• Mebi

• Kibi

• Tebi

• Gibi

The correct order of (prefix) names for powers of 10¹⁵ 10¹⁸ 10²¹ and 10²⁴ are (powers of 10 to 15, 18, 21 and 24)

• Peta Exa Zetta Yotta

• Femto Atto Zepto Yotto

• Terra Peta Exa Zetta

• Mega Giga Terra Peta