Comment by illwrks

Honestly... at this age I would focus on the practical everyday application of fractions, percentages, addition and subtraction, multiplication and division through everyday activities... don't force it, make it into a game - share sweets, cake etc, play card/board games...

'Can I have 50% of this, half of that..., can you give me two sweets, how many do you have left' etc.

When they are a bit older introduce them to money and let them buy small items. Doing it this way is more subtle, if you push studying too much you might end up with the opposite, them hating maths etc.