Keystones — Capstone
Five GCSE retrieval questions · 19 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 6
Answer: 4(x - 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 56°. Give your answer to 2 decimal places
Answer: 141.77cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 48, 46, 77, 46, 89, 94. Give your answer to 2 decimal places
Answer: Mean = 66.86, Median = 68, Range = 48