Keystones — Capstone
Five GCSE retrieval questions · 3 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 8
Answer: 3(x + 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 25cm, angle = 57°. Give your answer to 2 decimal places
Answer: 136.28cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 45:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 87, 43, 80, 97, 74, 37, 80. Give your answer to 2 decimal places
Answer: Mean = 70.13, Median = 77, Range = 60