Keystones — Lintel
Five GCSE retrieval questions · 9 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,400,000 in standard form
Answer: 6.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 77
Answer: (x + 11)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.32cm -
4. Ratio Mixed ratio problems
Simplify: 8:12:8
Answer: 2:3:2 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 22, 28, 28, 22, 23, what is the missing number?
Answer: 9