Keystones — Capstone
Five GCSE retrieval questions · 19 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 15
Answer: 3(x - 4)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 12cm, angle = 68°. Give your answer to 2 decimal places
Answer: 161.33cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:28:20 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 59, 51, 95, 39, 42, 65. Give your answer to 2 decimal places
Answer: Mean = 59.71, Median = 59, Range = 56