Keystones — Capstone
Five GCSE retrieval questions · 13 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√96
Answer: 16√6 -
2. Algebra Completing the square
Complete the square: x² + 7x + 12
Answer: (x + 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 15cm, angle = 57°. Give your answer to 2 decimal places
Answer: 119.51cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 90, 73, 10, 77, 34, 70, 98, 93. Give your answer to 2 decimal places
Answer: Mean = 69.78, Median = 77, Range = 88