Keystones — Capstone
Five GCSE retrieval questions · 29 June 2017 · 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 - 12
Answer: (x + 7⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 236.2cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 87, 75, 12, 15, 58, 39. Give your answer to 2 decimal places
Answer: Mean = 53.43, Median = 58, Range = 76