Keystones — Capstone
Five GCSE retrieval questions · 18 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 4
Answer: 2(x - 4)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 49°. Give your answer to 2 decimal places
Answer: 316.98cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 8:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 68, 18, 70, 53, 16, 21
Answer: Mean = 46, Median = 53, Range = 60