The following resources will help you to tackle the various calculations relating to fractions, decimals and percentages:
Introduction to Fractions - Open University
Finding a Fraction of a Number - Maths Doctor
Simplifying Fractions - Maths Doctor
Learning to multiply fractions efficiently and confidently will help you to work out drug calculations confidently and efficiently. It is absolutely vital to many of the standard formulae used in drug calculations. Thankfully, it is much easier than you probably remember. The screencast below will help you to understand the process. Please do follow the other links available on this site if you are having difficulties with understanding related concepts such as cancelling down. Alternatively, please feel free to book a tutorial or a small group workshop, where I will be able to consolidate your understanding of these calculations.
Multiplying Fractions - Khan Academy
You may need to revise your written division methods from Topic 1 before attempting this section.
Alternatively, it is a very good idea to memorise the most common equivalencies between decimals and fractions so thoroughly that they become second nature to you.
Converting Fractions to Decimals - Khan Academy
Converting Decimals to Fractions - Khan Academy
Fractions, Decimals and Percentages - Khan Academy
Fractions, Decimals and Percentages - Maths Doctor
Once you are confident with all of these, try the test below to check your skills!