Keystones — Capstone
Five GCSE retrieval questions · 29 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√90
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - 9x + 8
Answer: (x - 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 60°. Give your answer to 2 decimal places
Answer: 106.95cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 9:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 29, 67, 14, 65, 14, 87, 46. Give your answer to 2 decimal places
Answer: Mean = 48.88, Median = 55.5, Range = 73