Keystones — Capstone
Five GCSE retrieval questions · 14 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 11
Answer: (x + 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 242.67cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 71, 51, 67, 15, 16, 39. Give your answer to 2 decimal places
Answer: Mean = 40.57, Median = 39, Range = 56