Keystones — Capstone
Five GCSE retrieval questions · 4 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 2
Answer: 2(x + 2)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 25cm, angle = 55°. Give your answer to 2 decimal places
Answer: 174.07cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 97, 48, 73, 38, 29, 31. Give your answer to 2 decimal places
Answer: Mean = 54.86, Median = 48, Range = 68