Keystones — Capstone
Five GCSE retrieval questions · 21 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² + 3x + 8
Answer: (x + 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 16cm, angle = 61°. Give your answer to 2 decimal places
Answer: 188.92cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 40:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 43, 65, 99, 89, 38, 45. Give your answer to 2 decimal places
Answer: Mean = 67.43, Median = 65, Range = 61