Keystones — Capstone
Five GCSE retrieval questions · 19 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: x² - 3x - 12
Answer: (x - 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 79°. Give your answer to 2 decimal places
Answer: 208.6cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 75, 92, 26, 16, 76, 44, 21. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 50.5, Range = 76