Keystones — Cornerstone

Five GCSE retrieval questions · 21 January 2023 · mathsvault.uk/keystones

1. Number

Simplify: x⁶ × x⁵

Answer: x¹¹
2. Algebra

Solve: x + 13 = 18

Answer: x = 5
3. Geometry

Opposite = 12cm, hypotenuse = 13.9cm. Find the angle

Answer: 60° (approximately)
4. Ratio

Simplify: 15:6:15

Answer: 5:2:5
5. Statistics

Find the mean of: 16, 20, 3, 12

Answer: 12.75

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