Keystones — Capstone
Five GCSE retrieval questions · 3 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² + x - 10
Answer: (x + 1⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 24cm, angle = 68°. Give your answer to 2 decimal places
Answer: 178.02cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 9:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 79, 29, 71, 15, 20, 45, 32. Give your answer to 2 decimal places
Answer: Mean = 48.38, Median = 38.5, Range = 81