Keystones — Lintel
Five GCSE retrieval questions · 12 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 830,000,000 in standard form
Answer: 8.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.59cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 14:2. What fraction of the beads are purple?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 29, 24, 27, 44, what is the missing number?
Answer: 31