Keystones — Lintel
Five GCSE retrieval questions · 23 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00075 in standard form
Answer: 7.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 25.54cm -
4. Ratio Mixed ratio problems
Divide 180 in the ratio 2:1:3
Answer: 60, 30 and 90 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 45, 21, 27, 44, 47, what is the missing number?
Answer: 44