Keystones — Capstone
Five GCSE retrieval questions · 9 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 5
Answer: 2(x + 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 61°. Give your answer to 2 decimal places
Answer: 166.18cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 21:18:4 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 47, 32, 65, 18, 14, 65. Give your answer to 2 decimal places
Answer: Mean = 48.57, Median = 47, Range = 85