Keystones — Capstone
Five GCSE retrieval questions · 22 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: x² + 5x - 9
Answer: (x + 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 19cm, angle = 56°. Give your answer to 2 decimal places
Answer: 196.9cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 41, 18, 69, 77, 54, 80, 93. Give your answer to 2 decimal places
Answer: Mean = 55.38, Median = 61.5, Range = 82