Keystones — Lintel
Five GCSE retrieval questions · 24 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 93,000,000 in standard form
Answer: 9.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 21x + 110
Answer: (x + 11)(x + 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.28cm -
4. Ratio Mixed ratio problems
Simplify: 9:18:18
Answer: 1:2:2 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 20, 36, 41, 39, 44, what is the missing number?
Answer: 30