Keystones — Lintel

Five GCSE retrieval questions · 9 March 2026 · mathsvault.uk/keystones

1. Number

Calculate: 998 + 826

Answer: 1824
2. Algebra

Solve: ^x⁄₆ = 6.6666666666667

Answer: x = 40
3. Geometry

Calculate the area of a right triangle with perpendicular sides 10cm and 8cm

Answer: 40cm²
4. Ratio

Simplify: 24:16:16

Answer: 3:2:2
5. Statistics

Find the range of: -23, -21, 23, 11, 27

Answer: 50

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