Keystones — Capstone
Five GCSE retrieval questions · 25 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 3
Answer: 4(x - 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 74°. Give your answer to 2 decimal places
Answer: 228.78cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 80, 47, 95, 68, 85, 80, 92. Give your answer to 2 decimal places
Answer: Mean = 77.13, Median = 80, Range = 48