A number thermometer for the wall going from 10 down to -10. I prefer to have a vertical number line rather than a horizontal one, as it feels much easier to explain numbers getting higher and lower if they’re going up and down.
A short investigation that has students finding the number of possible combinations of pairs items from a given set, through listing numbers of games played in different sizes of sports league. Able students will find the algebraic rule - n(n-1) games when playing home and away - and find the link to triangle numbers when teams only play each other once. A good mix of algebra and probability themes in this, and a wide range of age groups can find it useful at their level. I'm sharing it as a Wo