Keystones — Lintel
Five GCSE retrieval questions · 6 October 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0039
Answer: 3.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 56°. Find opposite
Answer: 28.2cm -
4. Ratio Mixed ratio problems
Divide 208 in the ratio 1:1:2
Answer: 52, 52 and 104 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 24, 45, 43, 21, what is the missing number?
Answer: 37