Keystones — Lintel
Five GCSE retrieval questions · 18 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 97,000 in standard form
Answer: 9.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 3
Answer: (x - 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.92cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 15:7. What fraction of the beads are black?
Answer: 15⁄22 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 29, 33, 21, 26, 20, what is the missing number?
Answer: 27