Keystones — Capstone
Five GCSE retrieval questions · 20 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 13
Answer: 4(x + 3)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 77°. Give your answer to 2 decimal places
Answer: 219.23cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:14:8 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 96, 47, 46, 77, 53, 89. Give your answer to 2 decimal places
Answer: Mean = 71.86, Median = 77, Range = 50