Keystones — Lintel
Five GCSE retrieval questions · 13 February 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
53000000
Answer: 5.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 59°. Find opposite
Answer: 34.9cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:12
Answer: 3:2:3 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 37, 42, 42, 20, 42, what is the missing number?
Answer: -9