Keystones — Capstone
Five GCSE retrieval questions · 3 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 2
Answer: 5(x - 5)² - 127 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 40°. Give your answer to 2 decimal places
Answer: 80.99cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 59, 49, 15, 82, 57, 61, 91, 35
Answer: Mean = 57, Median = 59, Range = 76