Decimals show how numbers that are in between whole numbers.
Decimals can be converted to and from percentages. and to and from fractions. What is a decimal? A decimal is a way of writing a number that is not whole. Decimal numbers are 'in-between' numbers.
For example, 5.25 is in between the numbers 5 and 6. It is more than 5, but less than 6. To find out exactly what a decimal number represents, use place value headings, that is tenths, hundredths etc.