Keystones — Capstone
Five GCSE retrieval questions · 7 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√175
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 2
Answer: 4(x - 5)² - 102 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 199.92cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 24, 64, 57, 42, 41, 97. Give your answer to 2 decimal places
Answer: Mean = 53.14, Median = 47, Range = 73