This is an interactive model of integers as red and blue counters, using the p5 javascript library. This is designed to help students explore properties of adding and subtracting integers, using a ...

In National 4 Maths use negative numbers in addition and subtraction problems including subtracting a negative number.

When adding and subtracting numbers it's important to be consistent with positive and negative values. Remember that two plus signs or two minus signs make a positive.