Keystones — Capstone
Five GCSE retrieval questions · 20 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√45
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 4
Answer: 3(x + 3)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 21cm, angle = 62°. Give your answer to 2 decimal places
Answer: 203.96cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 45:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 95, 57, 73, 60, 12, 61, 93, 58. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 60, Range = 83