Keystones — Capstone
Five GCSE retrieval questions · 15 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 9
Answer: (x - 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 12cm, angle = 65°. Give your answer to 2 decimal places
Answer: 70.69cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 20:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 66, 52, 73, 84, 46, 65, 92. Give your answer to 2 decimal places
Answer: Mean = 63.63, Median = 65.5, Range = 61