Positive and negative numbers

problem
Pair sums

Age

11 to 14

Challenge level

Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?
problem
Consecutive negative numbers

Age

11 to 14

Challenge level

Do you notice anything about the solutions when you add and/or subtract consecutive negative numbers?
game
Favourite

Vector racer

Age

11 to 16

Challenge level

The classic vector racing game.
problem
Connect three

Age

11 to 16

Challenge level

In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?
article
The history of negative numbers

This article -useful for teachers and learners - gives a short account of the history of negative numbers.
game
Favourite

Vector gem collector

Age

14 to 18

Challenge level

Use vectors to collect as many gems as you can and bring them safely home!