Keystones — Capstone
Five GCSE retrieval questions · 21 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - 9x + 4
Answer: (x - 9⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 29cm, angle = 61°. Give your answer to 2 decimal places
Answer: 228.28cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 15:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 59, 41, 100, 17, 65, 34, 93, 94
Answer: Mean = 59, Median = 59, Range = 83