Keystones — Lintel
Five GCSE retrieval questions · 14 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,000,000 in standard form
Answer: 8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 90
Answer: (x + 10)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.46cm -
4. Ratio Mixed ratio problems
Simplify: 18:12:15
Answer: 6:4:5 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 42, 46, 18, 21, what is the missing number?
Answer: 38