Keystones — Capstone
Five GCSE retrieval questions · 6 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + 3x + 9
Answer: (x + 3⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 12cm, angle = 74°. Give your answer to 2 decimal places
Answer: 80.75cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 40:35:49 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 19, 18, 32, 42, 86, 50, 65, 63. Give your answer to 2 decimal places
Answer: Mean = 50.67, Median = 50, Range = 68