Keystones — Lintel
Five GCSE retrieval questions · 28 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 88,000,000 in standard form
Answer: 8.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 16.24cm -
4. Ratio Mixed ratio problems
Express the second part of 8:13 as a fraction in simplest form
Answer: 13⁄21 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 27, 18, 29, what is the missing number?
Answer: 38