Keystones — Capstone
Five GCSE retrieval questions · 28 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 7x - 6
Answer: (x - 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 55°. Give your answer to 2 decimal places
Answer: 163.42cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 36:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 58, 90, 56, 32, 42, 67, 31
Answer: Mean = 53, Median = 52, Range = 59