Positive and negative numbers

problem
Favourite

Minus One Two Three

Age

14 to 16

Challenge level

Substitute -1, -2 or -3, into an algebraic expression and you'll get three results. Is it possible to tell in advance which of those three will be the largest ?
problem
Favourite

Swimming Pool

Age

5 to 11

Challenge level

In this problem, we're investigating the number of steps we would climb up or down to get out of or into the swimming pool. How could you number the steps below the water?
problem
Favourite

First Connect Three

Age

7 to 11

Challenge level

Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?
problem
Favourite

More Tug of War

Age

7 to 11

Challenge level

In this game, you can add, subtract, multiply or divide the numbers on the dice. Which will you do so that you get to the end of the number line first?
problem
Favourite

Sea Level

Age

7 to 11

Challenge level

What numbers would you put on this number line as it goes under the sea level?
problem
Favourite

Consecutive Numbers

Age

7 to 14

Challenge level

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
problem
Favourite

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
Favourite

Strange Bank Account

Age

11 to 14

Challenge level

Imagine a very strange bank account where you are only allowed to do two things...
game
Favourite

Up, Down, Flying Around

Age

11 to 14

Challenge level

Play this game to learn about adding and subtracting positive and negative numbers
problem
Favourite

Weights

Age

11 to 14

Challenge level

Different combinations of the weights available allow you to make different totals. Which totals can you make?