Mastering Same Denominator Fractions: Practical Worksheets for 11+ Success
21 October 2026
Same denominator fractions made simple
Adding and subtracting fractions with the same denominator is a key skill for 11+ maths. Mastering this concept gives children a strong foundation for more complex fraction questions later on.
Step 1: Check the denominators
When both fractions have the same denominator, you are working with equal-sized parts. For example, in 3/8 + 4/8, both fractions are in eighths.
Step 2: Add or subtract the numerators
Focus on the top numbers. For addition, simply add them together. For subtraction, subtract the second numerator from the first. In our example: 3 + 4 = 7.
Step 3: Keep the denominator the same
The denominator stays as it is. In our example, the answer is 7/8. If you were subtracting, such as 7/8 - 3/8, you would do 7 - 3 = 4, so the answer would be 4/8.
Step 4: Simplify the fraction if possible
Check if your answer can be simplified. For 7/8, it cannot be reduced further. For 4/8, divide both numbers by 4 to get 1/2.
Worked example
3/8 + 4/8
Add the numerators: 3 + 4 = 7
Keep the denominator: 8
The answer is 7/8.
Keep practising
Encourage your child to try more examples with different numerators and the same denominator. Regular practice will help them feel confident with these types of questions.
Key insight: Practising fractions with the same denominator helps children build the essential skills they need before tackling more complex fraction problems.
