Keystones — Lintel
Five GCSE retrieval questions · 8 August 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.083
Answer: 8.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 31°. Find opposite
Answer: 15cm -
4. Ratio Mixed ratio problems
Divide 162 in the ratio 2:1:3
Answer: 54, 27 and 81 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 33, 43, 16, 24, 28, what is the missing number?
Answer: 48