Keystones — Capstone
Five GCSE retrieval questions · 17 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 4
Answer: (x + 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 14cm, angle = 63°. Give your answer to 2 decimal places
Answer: 130.98cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 72:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 43, 29, 79, 88, 37, 40, 72, 89. Give your answer to 2 decimal places
Answer: Mean = 59.44, Median = 58, Range = 60