Keystones — Capstone
Five GCSE retrieval questions · 19 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 12
Answer: (x - 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 46°. Give your answer to 2 decimal places
Answer: 90.64cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 15, 99, 10, 12, 32, 57, 78, 45. Give your answer to 2 decimal places
Answer: Mean = 48.11, Median = 45, Range = 89