Keystones — Lintel
Five GCSE retrieval questions · 23 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 63,000 in standard form
Answer: 6.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 36
Answer: (x + 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 10.21cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 3:11:10. What fraction of the beads are yellow?
Answer: 5⁄12 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 31, 36, 50, what is the missing number?
Answer: 19