Keystones — Capstone
Five GCSE retrieval questions · 18 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 7x + 7
Answer: (x + 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 19cm, angle = 77°. Give your answer to 2 decimal places
Answer: 268.44cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 76, 93, 71, 53, 91, 33. Give your answer to 2 decimal places
Answer: Mean = 71.14, Median = 76, Range = 60