Keystones — Cornerstone
Five GCSE retrieval questions · 20 July 2021 · mathsvault.uk/keystones
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1. Number
What is the missing number: 78 + ? = 171
Answer: 93 -
2. Algebra
Factorise: 2x² + 8x
Answer: 2x(x + 4) -
3. Geometry
Opposite = 15cm, hypotenuse = 30cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Find 29% of 459
Answer: 133.11 -
5. Statistics
Calculate the mean of: 43, 42, 33, 20, 12, 32, 21
Answer: 29