Keystones — Capstone
Five GCSE retrieval questions · 18 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: x² + 11x - 11
Answer: (x + 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 63°. Give your answer to 2 decimal places
Answer: 192.46cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 3:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 71, 59, 80, 44, 39, 70, 55, 98. Give your answer to 2 decimal places
Answer: Mean = 64.56, Median = 65, Range = 59