Keystones Lintel — 16 January 2026

Keystones — Lintel

Five GCSE retrieval questions · 16 January 2026 · mathsvault.uk/keystones

1. Number Multiplying in standard form

Multiply: 8.3 × 10⁷ × 6.5 × 10⁴

Answer: 5.4 × 10¹²
2. Algebra Solving monic quadratics

Solve: x² -2x - 8 = 0

Answer: x = 4 or x = -2
3. Geometry SOHCAHTOA — missing angle

Adjacent = 23cm, hypotenuse = 35cm. Find the angle

Answer: 48.9°
4. Ratio Reverse percentages

After a 30% decrease, a value is 311.5. What was the original?

Answer: 445
5. Statistics Range

Find the range of: 36, 50, -1, 30, -27

Answer: 77

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