Keystones — Capstone
Five GCSE retrieval questions · 7 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 8
Answer: (x + 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 42°. Give your answer to 2 decimal places
Answer: 119.44cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 55, 96, 66, 22, 33, 85, 93. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 60.5, Range = 74