I pinched a great idea from Tes last week for a numeracy activity (sorry to the person who shared I can’t remember who you are to reference you). Pupils had to find the code to open the padlocks to the box. Simple and probably used by many people before, but first time I had used the idea, and definitely one I’ll use again. It was with a bottom set year 9, and most were really motivated to completed these column addition and subtractions, including borrowing and decimals, so they could have a go at unlocking the box.
You might notice the locks didn’t actually lock the box, but the pupils played along!