Keystones — Lintel
Five GCSE retrieval questions · 30 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000086 in standard form
Answer: 8.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 66
Answer: (x + 6)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.23cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 15 minutes
Answer: 8:1 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 15, 31, 45, what is the missing number?
Answer: 69