Keystones — Lintel
Five GCSE retrieval questions · 16 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00069 in standard form
Answer: 6.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.37cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 20 minutes
Answer: 12:1 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 32, 27, 41, 44, what is the missing number?
Answer: 31