Keystones — Capstone
Five GCSE retrieval questions · 13 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² + 9x + 7
Answer: (x + 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 72°. Give your answer to 2 decimal places
Answer: 308.14cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 88, 60, 11, 11, 83, 85, 12, 60. Give your answer to 2 decimal places
Answer: Mean = 56.56, Median = 60, Range = 88