Keystones — Lintel
Five GCSE retrieval questions · 6 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 28.76cm -
4. Ratio Mixed ratio problems
Divide 220 in the ratio 4:4:3
Answer: 80, 80 and 60 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 36, 41, 39, 22, 15, what is the missing number?
Answer: 27