Keystones — Lintel
Five GCSE retrieval questions · 26 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.059 in standard form
Answer: 5.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 77
Answer: (x + 11)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m : 55cm
Answer: 80:11 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 17, 43, 48, what is the missing number?
Answer: 20