Keystones — Lintel
Five GCSE retrieval questions · 6 October 2019 · 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 - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 51°. Find opposite
Answer: 24.7cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 1:4:2
Answer: 27, 108 and 54 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 45, 38, 19, 26, 25, what is the missing number?
Answer: 15