Keystones — Capstone
Five GCSE retrieval questions · 17 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 5
Answer: 3(x + 5)² - 70 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 19cm, angle = 40°. Give your answer to 2 decimal places
Answer: 116.02cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 56:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 11, 57, 22, 77, 80, 41, 81
Answer: Mean = 49.75, Median = 49, Range = 70