Keystones — Lintel
Five GCSE retrieval questions · 5 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000036 in standard form
Answer: 3.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 30.87cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 4:12:4. What fraction of the sweets are blue?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 30, 37, 19, 41, what is the missing number?
Answer: 38