Keystones — Lintel
Five GCSE retrieval questions · 29 June 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.019
Answer: 1.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 39°. Find opposite
Answer: 9.7cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:4
Answer: 3:3:2 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 31, 48, 43, what is the missing number?
Answer: 18