Keystones — Lintel
Five GCSE retrieval questions · 30 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.047
Answer: 4.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 35°. Find opposite
Answer: 18.2cm -
4. Ratio Mixed ratio problems
Divide 133 in the ratio 1:4:2
Answer: 19, 76 and 38 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 28, 39, 43, 16, 16, what is the missing number?
Answer: 86