Keystones — Lintel
Five GCSE retrieval questions · 27 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.043
Answer: 4.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 36°. Find opposite
Answer: 12.4cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:8
Answer: 3:2:2 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 50, 36, 30, 47, what is the missing number?
Answer: -8