Keystones — Capstone
Five GCSE retrieval questions · 10 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 8
Answer: 5(x - 3)² - 53 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 62°. Give your answer to 2 decimal places
Answer: 114.78cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 72:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 43, 99, 54, 11, 85, 60, 66. Give your answer to 2 decimal places
Answer: Mean = 53.88, Median = 57, Range = 88