Keystones — Lintel
Five GCSE retrieval questions · 2 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
69000000
Answer: 6.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 37°. Find opposite
Answer: 7.5cm -
4. Ratio Mixed ratio problems
Divide 280 in the ratio 4:3:3
Answer: 112, 84 and 84 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 17, 45, 46, 25, 31, what is the missing number?
Answer: 4