Keystones — Lintel
Five GCSE retrieval questions · 5 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 96,000 in standard form
Answer: 9.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 14.42cm -
4. Ratio Mixed ratio problems
Divide 110 in the ratio 3:4:4
Answer: 30, 40 and 40 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 35, 22, 29, 36, what is the missing number?
Answer: 63