Keystones — Capstone
Five GCSE retrieval questions · 25 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
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 = 16cm, angle = 57°. Give your answer to 2 decimal places
Answer: 87.22cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 56:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 97, 83, 38, 13, 10, 44, 39, 82. Give your answer to 2 decimal places
Answer: Mean = 52.89, Median = 44, Range = 87