Keystones — Capstone
Five GCSE retrieval questions · 2 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 3
Answer: 5(x - 5)² - 128 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 55°. Give your answer to 2 decimal places
Answer: 196.6cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 48:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 91, 48, 84, 30, 40, 38. Give your answer to 2 decimal places
Answer: Mean = 52.86, Median = 40, Range = 61