Keystones — Lintel
Five GCSE retrieval questions · 21 November 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
79000000
Answer: 7.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 52°. Find opposite
Answer: 19.2cm -
4. Ratio Mixed ratio problems
Divide 130 in the ratio 3:1:1
Answer: 78, 26 and 26 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 30, 40, 46, 44, 25, what is the missing number?
Answer: -35