Keystones — Capstone
Five GCSE retrieval questions · 25 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: x² - 11x - 9
Answer: (x - 11⁄2)² - 157⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 29cm, angle = 49°. Give your answer to 2 decimal places
Answer: 262.64cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 8:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 21, 43, 23, 25, 49, 100, 82
Answer: Mean = 49.5, Median = 46, Range = 79