Mental calculations

Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.

Lolla bought a balloon at the circus. She gave the clown six coins to pay for it. What could Lolla have paid for the balloon?

Put operations signs between the numbers 3, 4, 5 and 6 to make the highest possible number and lowest possible number.

The value of the circle changes in each of the following problems. Can you discover its value in each problem?

Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?

These sixteen children are standing in four lines of four, one behind the other. They are each holding a card with a number on it. Can you work out the missing numbers?

These eleven shapes each stand for a different number. Can you use the number sentences to work out what they are?

Choose a symbol to put into the number sentence.

This group activity will encourage you to share calculation strategies and to think about which strategy might be the most efficient.

What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.