Keystones — Lintel
Five GCSE retrieval questions · 9 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000075 in standard form
Answer: 7.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 10.07cm -
4. Ratio Mixed ratio problems
Simplify: 16:8:8
Answer: 2:1:1 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 46, 41, 44, what is the missing number?
Answer: 9