Blank Dice - write anything on these with a Sharpie.
Dice are a very versatile resource in every classroom, and allows you to teach basic key maths concepts like counting, addition as well as subtraction. Roll the die and ask students what the number is that comes before the number on the die. And which number comes after. Roll two dice and multiply them. Or ask if the number is even or odd. There are so many activities you can do!
Dice are also perfect for more advanced lessons like probability. What is the chance to roll a 5? And what if you roll two dice? Or a 10-sided dice? Does the chance to roll a 5 change? Every classroom should have dice, from early primary to high schools.