Keystones — Capstone
Five GCSE retrieval questions · 9 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
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 = 15cm, b = 17cm, angle = 48°. Give your answer to 2 decimal places
Answer: 94.75cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 6:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 97, 39, 53, 87, 61, 46. Give your answer to 2 decimal places
Answer: Mean = 61.57, Median = 53, Range = 58