3.1 - Number Systems

What’s a natural number?

A whole number used for counting.

What’s a rational number?

Any value that can be expressed as a ratio or fraction.

What’s an irrational number?

Any value that can not be expressed as a fraction, e.g pi.

What is a real number?

Any natural, rational or irrational number.

What is an ordinal number?

Numbers that describe the numerical position of objects.

With an unsigned binary with n bits, what’s the maximum number you can represent?

2ⁿ - 1

What base is hexadecimal?

16

What is 10₁₀ in hexadecimal?

A₁₆

What is 15₁₀ in hexadecimal?

F₁₆

Why is hexadecimal used?

• Fewer mistakes are likely to be made

• Easier to write and remember