Keystones — Lintel
Five GCSE retrieval questions · 9 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000057 in standard form
Answer: 5.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 16
Answer: (x - 4)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.83cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 7:5:1. What fraction of the beads are white?
Answer: 5⁄13 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 31, 18, 42, what is the missing number?
Answer: 57