Keystones — Lintel
Five GCSE retrieval questions · 20 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0082 in standard form
Answer: 8.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 15.98cm -
4. Ratio Mixed ratio problems
Divide 192 in the ratio 3:3:2
Answer: 72, 72 and 48 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 34, 26, 18, 20, 37, what is the missing number?
Answer: 45