Keystones — Lintel
Five GCSE retrieval questions · 3 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00006 in standard form
Answer: 6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 10.62cm -
4. Ratio Mixed ratio problems
Divide 91 in the ratio 2:4:1
Answer: 26, 52 and 13 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 15, 17, 24, 29, 28, what is the missing number?
Answer: 55