Keystones — Lintel
Five GCSE retrieval questions · 21 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,300,000 in standard form
Answer: 6.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.62cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 1:7:7. What fraction of the beads are yellow?
Answer: 7⁄15 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 25, 44, 22, 34, 23, what is the missing number?
Answer: 56