Keystones — Lintel
Five GCSE retrieval questions · 29 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.029 in standard form
Answer: 2.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 20.26cm -
4. Ratio Mixed ratio problems
Divide 224 in the ratio 3:3:2
Answer: 84, 84 and 56 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 23, 50, 32, what is the missing number?
Answer: 19