Keystones — Capstone
Five GCSE retrieval questions · 15 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√250
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² - 9x + 11
Answer: (x - 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 18cm, angle = 57°. Give your answer to 2 decimal places
Answer: 203.8cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 81, 44, 72, 62, 49, 57, 43. Give your answer to 2 decimal places
Answer: Mean = 63.13, Median = 59.5, Range = 54