Keystones — Capstone
Five GCSE retrieval questions · 9 January 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 + 20x + 7
Answer: 2(x + 5)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 20cm, angle = 47°. Give your answer to 2 decimal places
Answer: 102.39cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 64, 67, 56, 14, 24, 93, 10, 89. Give your answer to 2 decimal places
Answer: Mean = 56.44, Median = 64, Range = 83