Keystones — Lintel
Five GCSE retrieval questions · 9 October 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00089
Answer: 8.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 46°. Find opposite
Answer: 12.4cm -
4. Ratio Mixed ratio problems
Divide 216 in the ratio 3:4:1
Answer: 81, 108 and 27 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 49, 39, 28, 15, what is the missing number?
Answer: 4