Keystones — Capstone
Five GCSE retrieval questions · 26 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 3
Answer: 2(x - 4)² - 29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 49°. Give your answer to 2 decimal places
Answer: 118.87cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 61, 94, 44, 97, 71, 38. Give your answer to 2 decimal places
Answer: Mean = 68.86, Median = 71, Range = 59