Keystones — Capstone
Five GCSE retrieval questions · 23 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 8
Answer: (x + 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 72°. Give your answer to 2 decimal places
Answer: 226.35cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 3:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 87, 74, 11, 45, 58, 100, 43. Give your answer to 2 decimal places
Answer: Mean = 58.88, Median = 55.5, Range = 89