Keystones — Lintel
Five GCSE retrieval questions · 16 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0057 in standard form
Answer: 5.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.03cm -
4. Ratio Mixed ratio problems
£210.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £90.00 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 41, 30, 27, 25, what is the missing number?
Answer: 52