Keystones — Lintel
Five GCSE retrieval questions · 1 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 780,000,000 in standard form
Answer: 7.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 40
Answer: (x - 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 17.62cm -
4. Ratio Mixed ratio problems
Divide 132 in the ratio 4:3:4
Answer: 48, 36 and 48 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 41, 42, 19, 34, 31, what is the missing number?
Answer: 37