Keystones — Capstone
Five GCSE retrieval questions · 1 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 10
Answer: 2(x + 4)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 68°. Give your answer to 2 decimal places
Answer: 233.65cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 27:6:14 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 93, 36, 60, 89, 38, 55, 21, 73. Give your answer to 2 decimal places
Answer: Mean = 56.67, Median = 55, Range = 72