Keystones — Capstone
Five GCSE retrieval questions · 26 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 1
Answer: 4(x + 6)² - 143 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 67°. Give your answer to 2 decimal places
Answer: 265.11cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 31, 70, 57, 47, 43, 91, 56, 100
Answer: Mean = 62, Median = 57, Range = 69