Work out the difference between 20% of 90 and 3/7 of 49

To determine the difference between 20% of 90 and 3/7 of 49, we first need to calculate each value separately. Starting with 20% of 90, we can convert the percentage into a decimal by dividing by 100, which gives us 0.20. Multiplying this decimal by 90 results in 18. Therefore, 20% of 90 is equal to 18. 

Next, we will calculate 3/7 of 49. To do this, we multiply 49 by the fraction 3/7. This can be simplified by performing the multiplication directly, which yields 21. Thus, 3/7 of 49 is equal to 21. 

Finally, we find the difference between the two calculated values. Subtracting 18 from 21 gives us a result of 3. Therefore, the difference between 20% of 90 and 3/7 of 49 is 3. For students seeking assistance with such calculations, a GCSE maths tutor can provide valuable guidance and support in mastering these concepts.