Keystones — Capstone
Five GCSE retrieval questions · 15 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√250
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² + 11x + 1
Answer: (x + 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 44°. Give your answer to 2 decimal places
Answer: 138.93cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 28, 36, 92, 14, 31, 12, 82
Answer: Mean = 49, Median = 33.5, Range = 85