Keystones — Capstone
Five GCSE retrieval questions · 29 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√18
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: x² - 7x - 12
Answer: (x - 7⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 62°. Give your answer to 2 decimal places
Answer: 150.cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 16:18:27 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 76, 57, 71, 47, 86, 51. Give your answer to 2 decimal places
Answer: Mean = 58.71, Median = 57, Range = 63