Keystones — Lintel
Five GCSE retrieval questions · 27 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000045 in standard form
Answer: 4.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.78cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 11:8. What fraction of the beads are red?
Answer: 11⁄19 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 27, 22, 43, what is the missing number?
Answer: 28