Keystones — Capstone
Five GCSE retrieval questions · 30 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√32
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: x² + 11x
Answer: (x + 11⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 19cm, angle = 77°. Give your answer to 2 decimal places
Answer: 111.08cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 6:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 39, 37, 73, 77, 10, 97, 74, 57. Give your answer to 2 decimal places
Answer: Mean = 57.33, Median = 57, Range = 87