11+ Maths: Converting Decimals to Fractions
21 October 2026
Why decimals to fractions matter
Converting decimals to fractions is a key skill for the 11+ maths exam. Many questions require children to switch between these forms quickly and accurately.
Step 1: Write the decimal as a fraction
Start by writing the decimal number over 1. For example, 0.75 becomes 0.75 over 1.
Step 2: Multiply to remove the decimal
Count the number of digits after the decimal point. Multiply both the top and bottom by 10 for each digit. For 0.75, there are two digits, so multiply by 100. This gives 75 over 100.
Step 3: Simplify the fraction
Find the greatest common factor of the numerator and denominator. Divide both by this number to simplify. For 75 over 100, the greatest common factor is 25. Divide to get 3 over 4.
Worked example
0.75 as a fraction
0.75 over 1
Multiply top and bottom by 100: 75 over 100
Divide both by 25: 3 over 4
The answer is 3 over 4.
Summary of the process
Write the decimal over 1, multiply to remove the decimal, and simplify the fraction. This method works for any decimal that ends.
Key insight: Understanding how to convert decimals to fractions builds confidence for many other 11+ maths topics, including percentages, ratio, and word problems.
