Comparing and ordering numbers

problem
Factor-multiple chains

Age

7 to 11

Challenge level

Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?
problem
Now and then

Age

7 to 11

Challenge level

Have a look at the results for some events at past Olympic Games. Can you use these to predict the results at the next Olympics?
problem
Truth or lie

Age

7 to 11

Challenge level

Take a look at the video of this trick. Can you perform it yourself? Why is this maths and not magic?
game
Favourite

Dicey operations

Age

7 to 14

Challenge level

In these addition and subtraction games, you'll need to think strategically to get closest to the target.
problem
Rod fractions

Age

7 to 14

Challenge level

Pick two rods of different colours. Given an unlimited supply of rods of each of the two colours, how can we work out what fraction the shorter rod is of the longer one?
game

Nice or nasty for two

Age

7 to 14

Challenge level

Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.
game
Favourite

More Dicey operations

Age

7 to 14

Challenge level

In these multiplication and division games, you'll need to think strategically to get closest to the target.
problem
Number lines in disguise

Age

7 to 14

Challenge level

Some of the numbers have fallen off Becky's number line. Can you figure out what they were?
problem
Diagonal sums

Age

7 to 14

Challenge level

In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite each other? What do you notice?
problem
Consecutive seven

Age

11 to 14

Challenge level

Can you arrange these numbers into 7 subsets, each of three numbers, so that when the numbers in each are added together, they make seven consecutive numbers?