Keystones — Lintel
Five GCSE retrieval questions · 11 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000097 in standard form
Answer: 9.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 10.94cm -
4. Ratio Mixed ratio problems
Divide 220 in the ratio 3:4:3
Answer: 66, 88 and 66 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 43, 33, 32, 23, 34, what is the missing number?
Answer: 51