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

The picture shows a lighthouse and many underwater creatures. If you know the markings on the lighthouse are 1m apart, can you work out the distances between some of the different creatures?

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

This article suggests some ways of making sense of calculations involving positive and negative numbers.

First Connect Three game for an adult and child. Use the dice numbers and either addition or subtraction to get three numbers in a straight line.

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?

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?

The idea of this game is to add or subtract the two numbers on the dice and cover the result on the grid, trying to get a line of three. Are there some numbers that are good to aim for?

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.

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

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

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

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

In this article for teachers, Liz Woodham describes resources on NRICH that can help primary-aged children get to grips with negative numbers.

How can we help students make sense of addition and subtraction of negative numbers?

What is the smallest number of answers you need to reveal in order to work out the missing headers?

The classic vector racing game brought to a screen near you.

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