Keystones — Capstone
Five GCSE retrieval questions · 6 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 65°. Give your answer to 2 decimal places
Answer: 258.3cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 13, 44, 73, 86, 15, 32. Give your answer to 2 decimal places
Answer: Mean = 40.57, Median = 32, Range = 73