This resource has been designed to investigate which numbers (from 1 to 20) can be ‘halved’. There is a introduction to ‘half’ on page one and x20 recap questions at the end.
We use optional Google Analytics (GA4) cookies to understand how the site is used, but only if you accept.
Essential cookies keep you signed in and the site working. You can change your choice using "Cookie settings" in the footer. Read our
cookie policy.