Estimating and approximating

problem
What's my weight?

Age

7 to 11

Challenge level

There are four equal weights on one side of the scale and an apple on the other side. What can you say that is true about the apple and the weights from the picture?
problem
Back to school

Age

7 to 11

Challenge level

Mr. Sunshine tells the children they will have 2 hours of homework. After several calculations, Harry says he hasn't got time to do this homework. Can you see where his reasoning is wrong?
problem
Nice or nasty

Age

7 to 11

Challenge level

There are nasty versions of this dice game but we'll start with the nice ones...
game

Four go for two

Age

7 to 11

Challenge level

Four Go game for an adult and child. Will you be the first to have four numbers in a row on the number line?
game

Dicey operations in line for two

Age

7 to 11

Challenge level

Dicey Operations for an adult and child. Can you get close to 1000 than your partner?
problem
The magic number and the hepta-tree

Age

7 to 11

Challenge level

Find the exact difference between the largest ball and the smallest ball on the Hepta Tree and then use this to work out the MAGIC NUMBER!
problem
Four go

Age

7 to 11

Challenge level

This challenge is a game for two players. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you get four in a row?
game
Favourite

Countdown

Age

7 to 14

Challenge level

Here is a chance to play a version of the classic Countdown Game.
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.
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.