Keystones — Capstone
Five GCSE retrieval questions · 16 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² - 5x - 1
Answer: (x - 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 57°. Give your answer to 2 decimal places
Answer: 167.73cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 18:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 65, 37, 66, 61, 90, 46, 32, 98
Answer: Mean = 64, Median = 65, Range = 66