Keystones — Capstone
Five GCSE retrieval questions · 16 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 6
Answer: 2(x - 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 72°. Give your answer to 2 decimal places
Answer: 199.72cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 83, 98, 95, 90, 67, 89, 43. Give your answer to 2 decimal places
Answer: Mean = 74.13, Median = 86, Range = 70