Keystones — Lintel
Five GCSE retrieval questions · 11 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00059 in standard form
Answer: 5.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.75cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 6:10. What fraction of the beads are black?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 40, 40, 21, 26, what is the missing number?
Answer: 28