Keystones — Lintel
Five GCSE retrieval questions · 3 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000044 in standard form
Answer: 4.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 60
Answer: (x + 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 38.55cm -
4. Ratio Mixed ratio problems
Simplify the ratio £9 : 50p
Answer: 18:1 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 22, 16, 44, what is the missing number?
Answer: 30