Keystones Lintel — 22 January 2023

Keystones — Lintel

Five GCSE retrieval questions · 22 January 2023 · mathsvault.uk/keystones

1. Number Converting to standard form

7000000

Answer: 7 × 10⁶
2. Algebra Factorising monic quadratics

Factorise: x² + 2x - 35

Answer: (x + 7)(x - 5)
3. Geometry SOHCAHTOA — missing length

Adjacent = 17cm, angle = 38°. Find opposite

Answer: 13.3cm
4. Ratio Mixed ratio problems

Divide 112 in the ratio 3:1:4

Answer: 42, 14 and 56
5. Statistics Mean

Calculate the mean of: 42, 28, 23, 10, 26, 21

Answer: 25

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