Keystones — Capstone
Five GCSE retrieval questions · 17 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² - 11x - 10
Answer: (x - 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 68°. Give your answer to 2 decimal places
Answer: 236.43cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 14:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 87, 67, 97, 75, 59, 31. Give your answer to 2 decimal places
Answer: Mean = 69.71, Median = 72, Range = 66