Keystones — Capstone
Five GCSE retrieval questions · 26 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + 5x - 5
Answer: (x + 5⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 331.3cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 16, 78, 25, 37, 36, 99. Give your answer to 2 decimal places
Answer: Mean = 50.14, Median = 37, Range = 83