Keystones — Lintel
Five GCSE retrieval questions · 26 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0098
Answer: 9.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 58°. Find opposite
Answer: 38.4cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 2:1:1
Answer: 84, 42 and 42 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 21, 17, 37, 18, what is the missing number?
Answer: 7