Keystones — Lintel
Five GCSE retrieval questions · 30 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0071 in standard form
Answer: 7.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 30
Answer: (x + 6)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.08cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 2:1:1
Answer: 56, 28 and 28 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 29, 21, 21, what is the missing number?
Answer: 29