A child may learn how to do long division in class and then repeat it during homework, but to truly secure long division a child must repeat it over and over.
This has the side benefit of securing numeracy in general as long division involves addition, subtraction and multiplication – mostly mental.
Similarly, to secure numeracy in fractions, decimals and percentages requires repetition. By solving lots of similar but different problems a child will not only understand the relationship between 1/4, 0.25 and 25%, it will become fast and easy for them.
It’s not about memorizing how to turn 12% of 200 into a fraction, it’s about understanding the process of how to do it.
Repetition also gives a child a better feel for when something is wrong. For example if a child erroneously works out that 20% of 50 is 40, they should feel that this is incorrect, so they can go back and see where their mistake was.
The Key Stage Maths workbooks deliver repetition in all areas of the maths curriculum. Each book starting easy to secure confidence, then becoming progressively more difficult to secure numeracy.