Keystones — Capstone
Five GCSE retrieval questions · 25 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 1
Answer: 5(x - 6)² - 179 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 73°. Give your answer to 2 decimal places
Answer: 210.39cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 64:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 85, 62, 78, 63, 77, 98. Give your answer to 2 decimal places
Answer: Mean = 79.14, Median = 78, Range = 36