Keystones — Capstone
Five GCSE retrieval questions · 24 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: x² - 7x - 11
Answer: (x - 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 57°. Give your answer to 2 decimal places
Answer: 166.06cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 97, 93, 97, 34, 80, 10, 68. Give your answer to 2 decimal places
Answer: Mean = 65.13, Median = 74, Range = 87