Keystones — Capstone
Five GCSE retrieval questions · 13 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 7x - 2
Answer: (x - 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 70°. Give your answer to 2 decimal places
Answer: 144.71cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 20:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 74, 97, 33, 97, 67, 17, 46. Give your answer to 2 decimal places
Answer: Mean = 55.88, Median = 56.5, Range = 81