Keystones — Capstone
Five GCSE retrieval questions · 3 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√45
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 10
Answer: 3(x + 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 24cm, angle = 71°. Give your answer to 2 decimal places
Answer: 329.04cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 47, 45, 90, 55, 33, 96, 43. Give your answer to 2 decimal places
Answer: Mean = 61.38, Median = 51, Range = 63