Keystones — Lintel
Five GCSE retrieval questions · 21 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00075 in standard form
Answer: 7.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.17cm -
4. Ratio Mixed ratio problems
Divide 203 in the ratio 4:1:2
Answer: 116, 29 and 58 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 48, 37, 40, 24, 22, what is the missing number?
Answer: 45