Keystones — Lintel
Five GCSE retrieval questions · 20 September 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
750000
Answer: 7.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 42°. Find opposite
Answer: 17.cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 21, 21, 29, what is the missing number?
Answer: 53