Keystones — Capstone
Five GCSE retrieval questions · 5 September 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 - 7x + 2
Answer: (x - 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 24cm, angle = 44°. Give your answer to 2 decimal places
Answer: 241.74cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 76, 96, 82, 62, 40, 80, 30, 76. Give your answer to 2 decimal places
Answer: Mean = 63.22, Median = 76, Range = 69