Keystones — Capstone
Five GCSE retrieval questions · 5 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² + 7x - 1
Answer: (x + 7⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 54°. Give your answer to 2 decimal places
Answer: 266.98cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:63:18 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 92, 99, 34, 97, 86, 64. Give your answer to 2 decimal places
Answer: Mean = 72.14, Median = 86, Range = 66