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GCSE Mathematics · key term
The number with the same magnitude but the opposite sign; for example, the opposite of is .
Used by Edexcel and OCR
Specification N2 · Paper 1, Paper 2, Paper 3
Revise: Calculating with Positive and Negative NumbersPositive and negative numbers describe values on opposite sides of zero. On a number line, positive numbers lie to the right of zero and negative numbers lie to the left. Moving right increases a value; moving left decreases it.
Specification 8.04b · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
Sides or angles that lie across from one another rather than sharing a vertex.
Treat a subtraction sign and a negative sign as different jobs. Rewrite subtraction as addition of the opposite before calculating if the signs look confusing.
When finding an angle, give a geometrical reason such as “opposite angles in a parallelogram are equal” or “co-interior angles on parallel lines sum to ”.
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A parallelogram has both pairs of opposite sides parallel.
Do not use the converse of a property without knowing that it is a valid test. For example, one pair of equal opposite sides alone does not prove that a quadrilateral is a parallelogram.