Keystones — Capstone
Five GCSE retrieval questions · 15 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² - 11x - 10
Answer: (x - 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 27cm, angle = 64°. Give your answer to 2 decimal places
Answer: 351.88cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 32:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 11, 43, 85, 90, 18, 59, 33, 80. Give your answer to 2 decimal places
Answer: Mean = 53.11, Median = 59, Range = 79