Keystones — Lintel
Five GCSE retrieval questions · 8 January 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
980000
Answer: 9.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 41°. Find opposite
Answer: 18.3cm -
4. Ratio Mixed ratio problems
£264.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £165.00 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 46, 39, 23, what is the missing number?
Answer: -20