Keystones — Capstone
Five GCSE retrieval questions · 12 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² - 11x - 12
Answer: (x - 11⁄2)² - 169⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 29cm, angle = 62°. Give your answer to 2 decimal places
Answer: 192.04cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:6:16 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 90, 66, 50, 81, 99, 43. Give your answer to 2 decimal places
Answer: Mean = 75.43, Median = 81, Range = 56