Keystones — Lintel
Five GCSE retrieval questions · 22 January 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00047
Answer: 4.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 39°. Find opposite
Answer: 19.4cm -
4. Ratio Mixed ratio problems
Express the first part of 4:3 as a fraction in simplest form
Answer: 4⁄7 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 49, 35, 22, 35, 21, what is the missing number?
Answer: -18