Keystones — Capstone
Five GCSE retrieval questions · 8 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√150
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² - 11x - 10
Answer: (x - 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 80°. Give your answer to 2 decimal places
Answer: 110.79cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 65, 53, 99, 28, 39, 10. Give your answer to 2 decimal places
Answer: Mean = 45.43, Median = 39, Range = 89