Keystones — Capstone
Five GCSE retrieval questions · 30 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√75
Answer: 25√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 10
Answer: (x - 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 29cm, angle = 73°. Give your answer to 2 decimal places
Answer: 402.13cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 15:24:20 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 18, 52, 76, 18, 87, 38. Give your answer to 2 decimal places
Answer: Mean = 53.14, Median = 52, Range = 69