Addition and subtraction

problem
Five steps to 50

Age

5 to 7

Challenge level

Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?
problem
Sums and differences 2

Age

7 to 11

Challenge level

Find the sum and difference between a pair of two-digit numbers. Now find the sum and difference between the sum and difference! What happens?
problem
Sums and differences 1

Age

7 to 11

Challenge level

This challenge focuses on finding the sum and difference of pairs of two-digit numbers.
problem
Unit differences

Age

5 to 7

Challenge level

This challenge is about finding the difference between numbers which have the same tens digit.
$What Could \It Be?$

problem
What could it be?

Age

5 to 7

Challenge level

In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?
problem
Money line-up

Age

5 to 7

Challenge level

In this game for two players, the aim is to make a row of four coins which total one dollar.
problem
Two spinners

Age

5 to 7

Challenge level

What two-digit numbers can you make with these two dice? What can't you make?
problem
Journeys

Age

7 to 11

Challenge level

Investigate the different distances of these car journeys and find out how long they take.
problem
Play to 37

Age

7 to 11

Challenge level

In this game for two players, the idea is to take it in turns to choose 1, 3, 5 or 7. The winner is the first to make the total 37.
problem
How much did it cost?

Age

7 to 11

Challenge level

Use your logical thinking skills to deduce how much Dan's crisps and ice cream cost altogether.