Keystones — Capstone
Five GCSE retrieval questions · 8 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 14
Answer: 3(x + 1)² + 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 24cm, angle = 70°. Give your answer to 2 decimal places
Answer: 214.25cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 10:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 75, 29, 23, 98, 46, 65, 74. Give your answer to 2 decimal places
Answer: Mean = 60.38, Median = 69, Range = 75