Keystones — Lintel
Five GCSE retrieval questions · 1 March 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00023
Answer: 2.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 47°. Find opposite
Answer: 16.cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 20, 38, 43, 19, what is the missing number?
Answer: 40