AC9M7N07Year 7NumberPractised on site

AC9M7N07 — Year 7 Number

Official Curriculum Content Description:

compare, order and solve problems involving addition and subtraction of integers

Worked Examples (1)

Example 1Integer Addition & Subtraction

A diver is at an elevation of

8\text{ m}

relative to sea level and descends by

4\text{ m}

. What is their new elevation in metres?

Common mistake: Sign confusion when adding or subtracting directed negative numbers

Correct Answer:

4

Worked Solution:

Adding a negative number is equivalent to subtracting its absolute value:

8 + (-4) = 8 - 4 = 4

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