Keystones — Capstone
Five GCSE retrieval questions · 5 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 8
Answer: 2(x + 4)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 17cm, angle = 74°. Give your answer to 2 decimal places
Answer: 114.39cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 28:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 19, 61, 73, 63, 76, 41. Give your answer to 2 decimal places
Answer: Mean = 53.43, Median = 61, Range = 57