Keystones — Capstone
Five GCSE retrieval questions · 1 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√45
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 1
Answer: 2(x - 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 14cm, angle = 51°. Give your answer to 2 decimal places
Answer: 65.28cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 56:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 69, 97, 47, 60, 23, 74. Give your answer to 2 decimal places
Answer: Mean = 64.71, Median = 69, Range = 74