Keystones — Capstone
Five GCSE retrieval questions · 29 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 3
Answer: 4(x - 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 19cm, angle = 56°. Give your answer to 2 decimal places
Answer: 94.51cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 81, 81, 21, 71, 92, 17. Give your answer to 2 decimal places
Answer: Mean = 54.57, Median = 71, Range = 75