Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?
Different combinations of the weights available allow you to make different totals. Which totals can you make?
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
Do you notice anything about the solutions when you add and/or subtract consecutive negative numbers?
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?
Play this game to learn about adding and subtracting positive and negative numbers
What is the smallest number of answers you need to reveal in order to work out the missing headers?
Imagine a very strange bank account where you are only allowed to do two things...
Investigate different ways of making £5 at Charlie's bank.
This article suggests some ways of making sense of calculations involving positive and negative numbers.
How can we help students make sense of addition and subtraction of negative numbers?
A brief history of negative numbers throughout the ages
In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?
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 ?
The classic vector racing game.
How many intersections do you expect from four straight lines ? Which three lines enclose a triangle with negative co-ordinates for every point ?
This article -useful for teachers and learners - gives a short account of the history of negative numbers.
Use vectors to collect as many gems as you can and bring them safely home!