Keystones — Capstone
Five GCSE retrieval questions · 15 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 7x + 6
Answer: (x - 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 16cm, angle = 40°. Give your answer to 2 decimal places
Answer: 82.28cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 72:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 49, 48, 80, 91, 63, 14, 47, 21. Give your answer to 2 decimal places
Answer: Mean = 56.22, Median = 49, Range = 79