Keystones — Lintel
Five GCSE retrieval questions · 2 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 47,000 in standard form
Answer: 4.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 21.23cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 7:1:5. What fraction of the beads are red?
Answer: 7⁄13 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 30, 19, 21, 50, what is the missing number?
Answer: 10