Keystones — Capstone
Five GCSE retrieval questions · 25 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 10
Answer: 3(x + 6)² - 98 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 74°. Give your answer to 2 decimal places
Answer: 224.94cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 3:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 46, 72, 42, 42, 68, 82, 99
Answer: Mean = 67.25, Median = 70, Range = 57