Keystones — Capstone
Five GCSE retrieval questions · 3 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 5
Answer: 3(x + 5)² - 80 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 69°. Give your answer to 2 decimal places
Answer: 190.45cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 42, 64, 41, 15, 55, 35. Give your answer to 2 decimal places
Answer: Mean = 49.57, Median = 42, Range = 80