Keystones — Lintel
Five GCSE retrieval questions · 27 November 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0092
Answer: 9.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 39°. Find opposite
Answer: 17cm -
4. Ratio Mixed ratio problems
Simplify: 20:12:24
Answer: 5:3:6 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 46, 34, 36, 28, what is the missing number?
Answer: -24