Keystones — Lintel
Five GCSE retrieval questions · 22 November 2022 · mathsvault.uk/keystones
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1. Number
Calculate: 3.55 + 35.03 + 0.79
Answer: 3.55 + 35.03 + 0.79 = 39.37 -
2. Algebra
Factorise fully: 9x² + 21x
Answer: 3x(3x + 7) -
3. Geometry
Opposite = 9cm, adjacent = 19cm. Calculate the angle
Answer: 25.3° -
4. Ratio
Simplify: 18:12:15
Answer: 6:4:5 -
5. Statistics
A bag has 4 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 1⁄3