Keystones — Lintel
Five GCSE retrieval questions · 10 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 87,000,000 in standard form
Answer: 8.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.68cm -
4. Ratio Mixed ratio problems
Express the first part of 12:15 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 36, 45, 45, 37, 35, what is the missing number?
Answer: 42