Keystones — Capstone
Five GCSE retrieval questions · 5 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² + 11x - 1
Answer: (x + 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 15cm, angle = 52°. Give your answer to 2 decimal places
Answer: 76.83cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 21:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 39, 29, 25, 75, 76, 59, 55. Give your answer to 2 decimal places
Answer: Mean = 57.13, Median = 57, Range = 74