Keystones — Lintel
Five GCSE retrieval questions · 14 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00028 in standard form
Answer: 2.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 17.6cm -
4. Ratio Mixed ratio problems
Divide 75 in the ratio 2:1:2
Answer: 30, 15 and 30 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 21, 30, 43, what is the missing number?
Answer: 26