Keystones — Capstone
Five GCSE retrieval questions · 25 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
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 = 12cm, b = 16cm, angle = 40°. Give your answer to 2 decimal places
Answer: 61.71cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 21:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 81, 24, 24, 100, 40, 100, 91, 39. Give your answer to 2 decimal places
Answer: Mean = 66.44, Median = 81, Range = 76