Classroom board

Using the board

Put this page on your interactive whiteboard and play a round as a class. There’s no clock, so take as long as you like. When someone suggests a step, tap the first number, then + − × or ÷, then the second number. The answer takes the second card’s place, and the working builds up on screen, so everyone can check it. The rules are the game’s: whole numbers only, and each card once.

• Warm-up has six small numbers and a target under 100. Classic swaps in a big number with a target up to 499, and Brain-burner two, up to 999.
• Your own numbers lets you set any six cards and a target, to fit a lesson. Show a way then finds a route, or the closest you can get.
• On a keyboard, 1 to 6 pick a card, + − * / pick a sign, and Backspace undoes.
• Nothing on this page is sent or saved, and there are no adverts on it.

For techniques to teach and more classroom ideas, including starting a league with your class, see Sharpen your mental maths.