Keystones — Capstone
Five GCSE retrieval questions · 10 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 7x + 5
Answer: (x - 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 20cm, angle = 63°. Give your answer to 2 decimal places
Answer: 258.39cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 14:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 100, 81, 48, 39, 72, 10, 24
Answer: Mean = 52.5, Median = 47, Range = 90