Keystones — Capstone
Five GCSE retrieval questions · 4 December 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 - 7x - 10
Answer: (x - 7⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 63°. Give your answer to 2 decimal places
Answer: 144.79cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 94, 61, 40, 37, 99, 71, 43
Answer: Mean = 61, Median = 52, Range = 62