Keystones — Capstone
Five GCSE retrieval questions · 21 June 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 - 8x + 12
Answer: 4(x - 1)² + 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 46°. Give your answer to 2 decimal places
Answer: 90.64cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 64:72:63 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 60, 93, 18, 16, 78, 56, 84
Answer: Mean = 62.75, Median = 69, Range = 81