Mental calculations

Which two items of fruit could Kate and Sam choose? Can you order the prices from lowest to highest?

Can you spot the mistake in this video? How would you work out the answer to this calculation?

Order these four calculations from easiest to hardest. How did you decide?

Can you match pairs of cards which show the same amount?

Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.

What do you notice about these squares of numbers? What is the same? What is different?

In Sam and Jill's garden there are two sorts of ladybirds with 7 spots or 4 spots. What numbers of total spots can you make?

As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?

Tim had nine cards each with a different number from 1 to 9 on it. How could he have put them into three piles so that the total in each pile was 15?