Keystones — Lintel
Five GCSE retrieval questions · 6 May 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
99000000
Answer: 9.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 42°. Find opposite
Answer: 23.4cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 3:3:1
Answer: 30, 30 and 10 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 50, 40, 31, what is the missing number?
Answer: -9