Keystones — Capstone
Five GCSE retrieval questions · 30 December 2013 · 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 + 9x + 1
Answer: (x + 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 76°. Give your answer to 2 decimal places
Answer: 196.97cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 16:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 27, 87, 22, 19, 29, 38, 40
Answer: Mean = 34.75, Median = 28, Range = 71