Keystones — Lintel
Five GCSE retrieval questions · 8 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00036 in standard form
Answer: 3.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 28.17cm -
4. Ratio Mixed ratio problems
£245.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £147.00 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 23, 44, 15, what is the missing number?
Answer: 62