Keystones — Capstone
Five GCSE retrieval questions · 11 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 3x - 3
Answer: (x + 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 14cm, angle = 42°. Give your answer to 2 decimal places
Answer: 112.41cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 10:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 94, 87, 81, 81, 68, 39, 76, 80. Give your answer to 2 decimal places
Answer: Mean = 72.67, Median = 80, Range = 55