Keystones — Capstone
Five GCSE retrieval questions · 30 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√20
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - 11x
Answer: (x - 11⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 19cm, angle = 48°. Give your answer to 2 decimal places
Answer: 155.32cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 35:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 31, 54, 51, 60, 98, 81. Give your answer to 2 decimal places
Answer: Mean = 56.86, Median = 54, Range = 75