Keystones — Capstone
Five GCSE retrieval questions · 6 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√160
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: x² + 7x + 1
Answer: (x + 7⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 46°. Give your answer to 2 decimal places
Answer: 145.67cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 38, 19, 88, 14, 98, 18, 32. Give your answer to 2 decimal places
Answer: Mean = 50.13, Median = 35, Range = 84