Keystones — Capstone
Five GCSE retrieval questions · 20 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 2
Answer: 2(x - 4)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 77°. Give your answer to 2 decimal places
Answer: 207.05cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 21:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 68, 40, 14, 30, 15, 13. Give your answer to 2 decimal places
Answer: Mean = 36.14, Median = 30, Range = 60