Keystones — Lintel
Five GCSE retrieval questions · 7 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 95,000,000 in standard form
Answer: 9.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.09cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 30 minutes
Answer: 4:1 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 50, 47, 31, 18, 33, what is the missing number?
Answer: 37