Keystones — Capstone
Five GCSE retrieval questions · 23 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: x² + 7x + 3
Answer: (x + 7⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 20cm, angle = 80°. Give your answer to 2 decimal places
Answer: 128.03cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 8:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 24, 100, 57, 64, 77, 35, 56, 47. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 56, Range = 80