Keystones — Lintel
Five GCSE retrieval questions · 15 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 160,000,000 in standard form
Answer: 1.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.07cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 litre : 250 ml
Answer: 4:1 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 44, 37, 21, what is the missing number?
Answer: 46