Keystones — Capstone
Five GCSE retrieval questions · 13 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 8
Answer: 4(x - 5)² - 108 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 14cm, angle = 71°. Give your answer to 2 decimal places
Answer: 119.14cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 28:21:3 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 29, 15, 44, 51, 18, 65. Give your answer to 2 decimal places
Answer: Mean = 42.57, Median = 44, Range = 61