Keystones — Capstone
Five GCSE retrieval questions · 28 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 2
Answer: 4(x - 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 79°. Give your answer to 2 decimal places
Answer: 267.98cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 81, 44, 19, 98, 58, 90, 77. Give your answer to 2 decimal places
Answer: Mean = 62.88, Median = 67.5, Range = 79