Keystones — Capstone
Five GCSE retrieval questions · 7 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 2
Answer: 4(x - 2)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 30cm, angle = 72°. Give your answer to 2 decimal places
Answer: 413.71cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 25:30:48 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 69, 89, 60, 84, 95, 35. Give your answer to 2 decimal places
Answer: Mean = 68.57, Median = 69, Range = 60