Keystones — Capstone
Five GCSE retrieval questions · 23 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 8
Answer: 3(x - 3)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 14cm, angle = 57°. Give your answer to 2 decimal places
Answer: 105.67cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 15:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 62, 18, 87, 90, 23, 18, 89
Answer: Mean = 57.25, Median = 66.5, Range = 72