Keystones — Capstone
Five GCSE retrieval questions · 22 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 6
Answer: 4(x + 3)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 70°. Give your answer to 2 decimal places
Answer: 196.4cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 58, 18, 13, 90, 74, 37, 58, 68. Give your answer to 2 decimal places
Answer: Mean = 56.11, Median = 58, Range = 77