Keystones — Capstone
Five GCSE retrieval questions · 2 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√28
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 11x - 10
Answer: (x - 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 21cm, angle = 69°. Give your answer to 2 decimal places
Answer: 225.46cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 10:6:21 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 37, 60, 100, 30, 19, 20, 64
Answer: Mean = 44.5, Median = 33.5, Range = 81