Keystones — Lintel
Five GCSE retrieval questions · 27 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
840000
Answer: 8.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 42°. Find opposite
Answer: 19.8cm -
4. Ratio Mixed ratio problems
£378.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £210.00 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 31, 43, 24, 17, 48, what is the missing number?
Answer: 47