Keystones — Capstone
Five GCSE retrieval questions · 8 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 72°. Give your answer to 2 decimal places
Answer: 358.55cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 21:24:32 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 91, 52, 63, 70, 42, 65. Give your answer to 2 decimal places
Answer: Mean = 68.57, Median = 65, Range = 55