Keystones — Capstone
Five GCSE retrieval questions · 4 December 2011 · 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: 4x² + 16x - 1
Answer: 4(x + 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 27cm, angle = 44°. Give your answer to 2 decimal places
Answer: 271.96cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 36:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 41, 80, 61, 10, 35, 70, 81, 59. Give your answer to 2 decimal places
Answer: Mean = 51.11, Median = 59, Range = 71