Keystones — Capstone
Five GCSE retrieval questions · 22 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
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 = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 71.34cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 25:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 18, 52, 65, 60, 93, 92, 33, 12
Answer: Mean = 49, Median = 52, Range = 81