Keystones — Lintel
Five GCSE retrieval questions · 26 May 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0025
Answer: 2.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 33°. Find opposite
Answer: 8.4cm -
4. Ratio Mixed ratio problems
Divide 125 in the ratio 1:1:3
Answer: 25, 25 and 75 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 42, 28, 46, 18, what is the missing number?
Answer: 11