Keystones — Cornerstone

Five GCSE retrieval questions · 31 December 2024 · mathsvault.uk/keystones

1. Number

81000000

Answer: 8.1 × 10⁷
2. Algebra

Factorise: 21x + 15

Answer: 3(7x + 5)
3. Geometry

Opposite = 6cm, hypotenuse = 12cm. Find the angle

Answer: 30° (approximately)
4. Ratio

Simplify: 18:18:15

Answer: 6:6:5
5. Statistics

Find the mean of: 7, 5, 11, 5

Answer: 7

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