Keystones — Lintel
Five GCSE retrieval questions · 13 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000042 in standard form
Answer: 4.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 66
Answer: (x + 11)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.03cm -
4. Ratio Mixed ratio problems
Simplify: 8:6:10
Answer: 4:3:5 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 27, 29, 33, 16, what is the missing number?
Answer: 35