Notes:
Exercises which self mark:
https://www.transum.org/Maths/Activity/FractionDecimalPercentage/
https://www.transum.org/software/SW/fracorder/fraction_order.asp?Level=1
https://www.transum.org/Software/SW/Starter_of_the_day/starter_May12.ASP
https://www.transum.org/software/SW/Starter_of_the_day/Students/Algebraic_Fractions.asp
https://www.transum.org/software/SW/Starter_of_the_day/Students/Percentages.asp