Keystones — Capstone
Five GCSE retrieval questions · 29 August 2014 · 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 - 3x - 7
Answer: (x - 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 15cm, angle = 65°. Give your answer to 2 decimal places
Answer: 203.92cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:56:16 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 61, 22, 89, 31, 47, 52
Answer: Mean = 55, Median = 52, Range = 67