Keystones — Capstone
Five GCSE retrieval questions · 14 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² + 9x + 2
Answer: (x + 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 65°. Give your answer to 2 decimal places
Answer: 328.54cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 14:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 73, 51, 22, 58, 17, 72. Give your answer to 2 decimal places
Answer: Mean = 53.57, Median = 58, Range = 65