Keystones — Lintel
Five GCSE retrieval questions · 27 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00015
Answer: 1.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 38°. Find opposite
Answer: 15.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 30, 45, 31, 25, what is the missing number?
Answer: -6