Keystones — Capstone
Five GCSE retrieval questions · 12 January 2014 · 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 - 10
Answer: (x - 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 47°. Give your answer to 2 decimal places
Answer: 193.44cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:56:16 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 30, 30, 24, 99, 27, 11, 95. Give your answer to 2 decimal places
Answer: Mean = 43.38, Median = 30, Range = 88