Binary and hexadecimal

Question 1

What is denary?

Answer 1

In denary (base 10) a number is made from digits between 0 and 9

Question 2

What is binary?

Answer 2

In binary (base 2) a number is made from digits between 0 and 1

Question 3

What is hexadecimal?

Answer 3

In hexadecimal (base 16) a number is made from digits between 0 and 9 and characters A to F. Since there is only space for 1 digit per column, the numbers 10 to 15 are replaced with the letters A-F.