Keystones — Capstone
Five GCSE retrieval questions · 24 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√24
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 6
Answer: 2(x - 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 53°. Give your answer to 2 decimal places
Answer: 172.51cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 2:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 55, 10, 14, 24, 51, 80, 70, 21. Give your answer to 2 decimal places
Answer: Mean = 43.78, Median = 51, Range = 70