Keystones — Capstone
Five GCSE retrieval questions · 30 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√99
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² + 9x - 10
Answer: (x + 9⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 74°. Give your answer to 2 decimal places
Answer: 273.96cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 4:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 39, 56, 92, 39, 65, 52, 93. Give your answer to 2 decimal places
Answer: Mean = 56.88, Median = 54, Range = 74