Keystones — Capstone
Five GCSE retrieval questions · 16 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 12
Answer: 4(x + 3)² - 48 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 50°. Give your answer to 2 decimal places
Answer: 123.72cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 79, 72, 85, 42, 64, 44, 38. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 60.5, Range = 47