Keystones — Lintel
Five GCSE retrieval questions · 8 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000046 in standard form
Answer: 4.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 36
Answer: (x + 9)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 18.21cm -
4. Ratio Mixed ratio problems
£144.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £96.00 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 28, 27, 29, what is the missing number?
Answer: 16