Keystones — Capstone
Five GCSE retrieval questions · 30 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 2x² + 16x
Answer: 2(x + 4)² - 32 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 111.47cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 15:40:24 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 68, 27, 52, 55, 42, 72, 46, 21
Answer: Mean = 46, Median = 46, Range = 51