Fully worked, step-by-step solutions to GCSE Ratio notation and simplifying questions. See exactly how to solve problems on simplifying ratios, common factors, highest common factor, writing a ratio.
Look for a common factor
Common factors of 4 and 6: 1, 2. The highest is 2.
Divide both parts by the highest common factor
Dividing both parts of a ratio by the same number does not change the ratio.
Write the simplified ratio
2 and 3 have no common factor left, so this is the simplest form.
Look for a common factor
Common factors of 6 and 8: 1, 2. The highest is 2.
Divide both parts by the highest common factor
Dividing both parts of a ratio by the same number does not change the ratio.
Write the simplified ratio
3 and 4 have no common factor left, so this is the simplest form.
Look for a common factor
Common factors of 10 and 15: 1, 5. The highest is 5.
Divide both parts by the highest common factor
Dividing both parts of a ratio by the same number does not change the ratio.
Write the simplified ratio
2 and 3 have no common factor left, so this is the simplest form.
Look for a common factor
Common factors of 12 and 20: 1, 2, 4. The highest is 4.
Divide both parts by the highest common factor
Dividing both parts of a ratio by the same number does not change the ratio.
Write the simplified ratio
3 and 5 have no common factor left, so this is the simplest form.
Look for a common factor
Common factors of 14 and 35: 1, 7. The highest is 7.
Divide both parts by the highest common factor
Dividing both parts of a ratio by the same number does not change the ratio.
Write the simplified ratio
2 and 5 have no common factor left, so this is the simplest form.
Create a free account to work through every GCSE Ratio notation and simplifying question with instant step-by-step worked solutions, progress tracking and interactive lessons.
No card required · Free forever