Keystones — Lintel
Five GCSE retrieval questions · 23 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0004
Answer: 4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 56°. Find opposite
Answer: 32.6cm -
4. Ratio Mixed ratio problems
Divide 91 in the ratio 2:4:1
Answer: 26, 52 and 13 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 28, 38, 49, what is the missing number?
Answer: 37