Keystones — Lintel
Five GCSE retrieval questions · 1 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
690000
Answer: 6.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 47°. Find opposite
Answer: 11.8cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 1:4:3
Answer: 21, 84 and 63 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 28, 37, 49, 19, 21, what is the missing number?
Answer: 20