Keystones — Lintel
Five GCSE retrieval questions · 23 April 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.068
Answer: 6.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 34°. Find opposite
Answer: 19.6cm -
4. Ratio Mixed ratio problems
Simplify: 18:6:12
Answer: 3:1:2 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 29, 16, 19, 35, what is the missing number?
Answer: 76