Keystones — Lintel
Five GCSE retrieval questions · 2 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000038 in standard form
Answer: 3.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 19.56cm -
4. Ratio Mixed ratio problems
Express the first part of 14:12 as a fraction in simplest form
Answer: 7⁄13 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 20, 26, 27, 23, 35, what is the missing number?
Answer: 19