Keystones — Lintel
Five GCSE retrieval questions · 5 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0039 in standard form
Answer: 3.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.75cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 2:3:3
Answer: 42, 63 and 63 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 35, 29, 31, what is the missing number?
Answer: 17