Keystones — Capstone
Five GCSE retrieval questions · 5 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 5x - 4
Answer: (x - 5⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 50°. Give your answer to 2 decimal places
Answer: 193.04cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 24, 16, 32, 35, 90, 20
Answer: Mean = 39, Median = 32, Range = 74