Keystones — Capstone
Five GCSE retrieval questions · 22 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 4
Answer: 4(x - 5)² - 104 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 55°. Give your answer to 2 decimal places
Answer: 296.94cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 27:24:56 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 39, 72, 75, 86, 55, 21. Give your answer to 2 decimal places
Answer: Mean = 54.14, Median = 55, Range = 65