Warnings Excel will only produce binary numbers with up to 10 bits. This means that it can only convert decimal numbers greater than -513 and less than 512.

Revise the methods of converting numbers to recurring decimals and, recurring decimals to fractions, and using dot notation in this maths guide.

Microsoft Excel depends on data that’s stored correctly. If you receive text values that should be real numbers, use one of these methods to get you back to the real work.

Rounding numbers can be a useful way to estimate a total. Find out how to round decimal numbers in this Bitesize Primary Second Level Maths guide.