## Factors and Prime Factors

Recognise/use multiples, factors (divisors), highest common factor, lowest common multiple and primes; prime factor decomposition. ActivInspire (includesTeacher Notes)PowerPointTeacher Notes (pdf)

## The Book of Cross Numbers

A free book of 66 cross numbers (here) originally created with X-figure PC program (now available as an app from here). Most of the answers are cross-referenced to other answers in the cross number puzzle, this means that it requires logical thinking and perseverance....

## Printable Paper

Updated July 2020. Sites that offer isometric, square, circular geoboard paper (ie grid/dotty/spotty) include the brilliant nRich site and the excellent Illuminations site. Click for an excel file here for Square Grid blanks of Dots between 3 and 25 dots across here...

## Factors of 24 Image

What do you and pupils see when you look at this image without the prompts? This image is about Factors of 24 and can lead on to an exploration of factors (which is directly linked to fractions with 24 as a denominator). Teacher notes with answers...

## Four 4s

A classic problem from the 19th century that can used as an introduction to priority of operations (BIDMAS) and factorials. There are different ways on finding solutions, and it depends on what you allow to be used. Can also be used to help show the difference between...