Loads of stuff here. (But no rearranging that requires factorisation) Example problem pairs. At least 5 different activities. A discussion about what it means for something to be the subject of an equation. An activity just asking pupils if the first step is correct (I think this is quite important). Some mini whiteboard work. A stardard exercise. An activity where they have to rearrange scientific formulas (is SMSC still a thing?)