Reading the time on an analogue clock face can prove very tricky for many children, especially if they have learning difficulties such as dyslexia. The problems usually occur when the minute hand has gone past the half hour so that we are looking forward to the next hour (eg a quarter to 9) rather than minutes past. We could say 45 minutes past 8, as it is technically correct, but no-one does! To complicate things even more, we do say 8:45 (eight forty five) when reading a digital clock!
This page, which can be found in Year 2 measures, just looks at quarter and half hours and can be used as a quick guide as to whether your child has grasped the concept.