I originally devised these resources for first year university students studying biomedical sciences who needed a bit of a refresher about standard form and prefixes. They have also proven useful for me for A level biology so I am sharing them here in the hope they are useful for others.
The resources include some explanation and worked examples along with some questions and answers. The maths is situated in a lot of real-world biomedical science (I used to be a biomedical science researcher).
Writing very large and very small numbers in standard form and with prefixes (pdf)
Calculating with very large and very small numbers (pdf)