Keystones — Capstone
Five GCSE retrieval questions · 16 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 4
Answer: (x - 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 17cm, angle = 51°. Give your answer to 2 decimal places
Answer: 105.69cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 2:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 96, 62, 88, 60, 87, 86. Give your answer to 2 decimal places
Answer: Mean = 71.29, Median = 86, Range = 76