Keystones — Lintel
Five GCSE retrieval questions · 21 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00033 in standard form
Answer: 3.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.73cm -
4. Ratio Mixed ratio problems
Divide 203 in the ratio 4:1:2
Answer: 116, 29 and 58 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 20, 21, 48, 23, 30, what is the missing number?
Answer: 26