Keystones — Lintel
Five GCSE retrieval questions · 14 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 55,000,000 in standard form
Answer: 5.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 6.58cm -
4. Ratio Mixed ratio problems
Divide 216 in the ratio 3:4:1
Answer: 81, 108 and 27 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 21, 45, 36, 33, 46, what is the missing number?
Answer: 35