Keystones — Capstone
Five GCSE retrieval questions · 16 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² + 3x - 8
Answer: (x + 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 29cm, angle = 43°. Give your answer to 2 decimal places
Answer: 237.34cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 32:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 41, 70, 60, 73, 33, 43. Give your answer to 2 decimal places
Answer: Mean = 55.29, Median = 60, Range = 40