Keystones — Capstone
Five GCSE retrieval questions · 24 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 9
Answer: (x - 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 71°. Give your answer to 2 decimal places
Answer: 219.36cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 8:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 70, 92, 61, 56, 92, 65. Give your answer to 2 decimal places
Answer: Mean = 73.14, Median = 70, Range = 36