Keystones — Capstone
Five GCSE retrieval questions · 5 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 1
Answer: 5(x + 6)² - 179 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 19cm, angle = 68°. Give your answer to 2 decimal places
Answer: 220.21cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 87, 94, 34, 35, 17, 44, 97
Answer: Mean = 53, Median = 39.5, Range = 81