Keystones — Capstone
Five GCSE retrieval questions · 12 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 3
Answer: 2(x - 6)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 17cm, angle = 59°. Give your answer to 2 decimal places
Answer: 211.29cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 8:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 11, 20, 17, 93, 31, 10, 66, 33. Give your answer to 2 decimal places
Answer: Mean = 37.67, Median = 31, Range = 83