Keystones — Lintel
Five GCSE retrieval questions · 28 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0022 in standard form
Answer: 2.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 41.42cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 950g
Answer: 40:19 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 16, 40, 50, what is the missing number?
Answer: 38