Keystones — Lintel
Five GCSE retrieval questions · 13 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.036 in standard form
Answer: 3.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.36cm -
4. Ratio Mixed ratio problems
Divide 117 in the ratio 3:4:2
Answer: 39, 52 and 26 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 33, 29, 42, 19, what is the missing number?
Answer: 17