Keystones — Lintel
Five GCSE retrieval questions · 15 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,800,000 in standard form
Answer: 5.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 21x + 108
Answer: (x - 9)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 20.31cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 15 minutes
Answer: 16:1 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 15, 25, 43, what is the missing number?
Answer: 21