Keystones — Lintel
Five GCSE retrieval questions · 8 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0086 in standard form
Answer: 8.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 9
Answer: (x - 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.79cm -
4. Ratio Mixed ratio problems
Divide 105 in the ratio 3:3:1
Answer: 45, 45 and 15 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 32, 17, 49, 19, what is the missing number?
Answer: 13