Keystones — Capstone
Five GCSE retrieval questions · 28 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 13
Answer: 4(x + 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 28cm, angle = 61°. Give your answer to 2 decimal places
Answer: 159.18cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 21, 68, 24, 68, 29, 59. Give your answer to 2 decimal places
Answer: Mean = 44.86, Median = 45, Range = 47