Keystones — Lintel
Five GCSE retrieval questions · 13 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 37,000,000 in standard form
Answer: 3.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 45°. Find opposite
Answer: 15cm -
4. Ratio Mixed ratio problems
Divide 175 in the ratio 1:4:2
Answer: 25, 100 and 50 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 37, 33, 46, 25, 49, what is the missing number?
Answer: 32