Keystones — Capstone
Five GCSE retrieval questions · 18 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² + 3x + 12
Answer: (x + 3⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 74°. Give your answer to 2 decimal places
Answer: 276.84cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 10:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 29, 94, 59, 92, 16, 40. Give your answer to 2 decimal places
Answer: Mean = 55.57, Median = 59, Range = 78