Keystones — Capstone
Five GCSE retrieval questions · 12 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² + 9x + 8
Answer: (x + 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 66°. Give your answer to 2 decimal places
Answer: 124.7cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:28:63 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 80, 68, 29, 61, 90, 38. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 61, Range = 61