Keystones — Capstone
Five GCSE retrieval questions · 22 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 3
Answer: 3(x - 5)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 53°. Give your answer to 2 decimal places
Answer: 128.98cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 80, 17, 57, 77, 79, 60, 18
Answer: Mean = 60.75, Median = 68.5, Range = 81