Subtracting Integers

Subtracting Integers covers taking away positive and negative numbers in NSW Year 7 maths (NESA outcome MA4‑INT‑C‑01). Taking away a positive moves left on the number line, while taking away a negative is the same as adding its opposite, so \(7 - (-3) = 7 + 3 = 10\).

You will see why this works by continuing a pattern, use number lines, simplify double signs and find missing numbers. Problems include the height of a seagull above a diver below the surface and the time difference between two cities from their UTC offsets. It is part of Year 7 Integers.