Keystones — Lintel
Five GCSE retrieval questions · 10 March 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00042
Answer: 4.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 52°. Find adjacent side
Answer: 12.9cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 33, 15, 27, 44, what is the missing number?
Answer: 41