This HCF and LCM worksheet covers prime factorisation and finding the HCF and LCM of two (or three) numbers. It features exam-style questions that gradually increase in difficulty.
These questions cover the full range of skills tested in GCSE and IGCSE for this topic. There are some problem-solving questions at the end.
Detailed solutions are included. There’s also a PowerPoint which allows you to easily select questions and their solutions for enlarged display on a screen, one at a time. This makes it easier (and quicker) to go through the solutions in class.
HCF and LCM treasure hunt activity
This activity gives students practice at working out LCM or HCF of two numbers. It’s perfect for revision, starters or plenaries. The treasure hunt format encourages students to answer questions quickly (and enjoy doing so!).
Unlike most treasure hunts, this one has the added feature that the answers to the questions give an encrypted clue. When students decipher this clue, it reveals where the treasure is hidden.
The question cards come in two sizes. Pin the large version around the room and use it for a whole class activity. Use the smaller cards for group or individual work. These smaller cards are particularly helpful during interventions.
David Morse has been a maths teacher for over 30 years, as well as an examiner. He creates lots of primary and secondary resources which you can find on his TES shop and on his website maths4everyone.com. You can also follow him on Twitter at @maths4everyone.
