Keystones — Lintel
Five GCSE retrieval questions · 2 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0085 in standard form
Answer: 8.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.79cm -
4. Ratio Mixed ratio problems
£308.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £88.00 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 40, 21, 41, 15, 47, what is the missing number?
Answer: 70