Keystones — Capstone
Five GCSE retrieval questions · 2 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: x² + x + 2
Answer: (x + 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 78°. Give your answer to 2 decimal places
Answer: 117.38cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 10, 99, 53, 69, 63, 83. Give your answer to 2 decimal places
Answer: Mean = 58.71, Median = 63, Range = 89