Keystones — Lintel
Five GCSE retrieval questions · 2 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 34,000,000 in standard form
Answer: 3.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.21cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 4:13. What fraction of the beads are orange?
Answer: 4⁄17 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 38, 44, 30, 32, what is the missing number?
Answer: 16