Keystones — Lintel
Five GCSE retrieval questions · 24 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000094 in standard form
Answer: 9.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.85cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 30 minutes
Answer: 10:1 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 43, 18, 29, 37, what is the missing number?
Answer: 38