Keystones — Capstone
Five GCSE retrieval questions · 4 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 6
Answer: (x - 5⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 51°. Give your answer to 2 decimal places
Answer: 191.57cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 45:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 88, 52, 100, 95, 48, 99, 68, 43. Give your answer to 2 decimal places
Answer: Mean = 67.22, Median = 68, Range = 88