Keystones — Lintel
Five GCSE retrieval questions · 16 November 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.079
Answer: 7.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 50°. Find opposite
Answer: 35.8cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:12
Answer: 3:5:6 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 45, 49, 34, what is the missing number?
Answer: 4