Keystones — Capstone
Five GCSE retrieval questions · 5 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 2
Answer: 4(x - 5)² - 98 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 14cm, angle = 54°. Give your answer to 2 decimal places
Answer: 79.28cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 56:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 10, 29, 16, 74, 21, 31, 40, 99. Give your answer to 2 decimal places
Answer: Mean = 44.11, Median = 31, Range = 89