Keystones — Lintel
Five GCSE retrieval questions · 16 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00095
Answer: 9.5 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 59°. Find opposite
Answer: 44.9cm -
4. Ratio Mixed ratio problems
Express the first part of 3:5 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 19, 28, 33, 19, what is the missing number?
Answer: 11