Keystones — Lintel
Five GCSE retrieval questions · 6 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 810,000 in standard form
Answer: 8.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.71cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 9:10:5. What fraction of the beads are orange?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 36, 25, 39, what is the missing number?
Answer: 32