Keystones — Lintel
Five GCSE retrieval questions · 26 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 190,000,000 in standard form
Answer: 1.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.53cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 750g
Answer: 8:3 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 18, 28, 28, what is the missing number?
Answer: 50