Keystones — Capstone
Five GCSE retrieval questions · 21 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√80
Answer: 16√5 -
2. Algebra Completing the square
Complete the square: x² - 11x - 7
Answer: (x - 11⁄2)² - 149⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 44°. Give your answer to 2 decimal places
Answer: 87.53cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 28:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 61, 26, 47, 90, 99, 37, 31, 62. Give your answer to 2 decimal places
Answer: Mean = 52.44, Median = 47, Range = 80