Keystones — Capstone
Five GCSE retrieval questions · 11 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 11
Answer: 4(x + 4)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 23cm, angle = 61°. Give your answer to 2 decimal places
Answer: 221.28cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 40:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 42, 61, 71, 10, 70, 31. Give your answer to 2 decimal places
Answer: Mean = 43.43, Median = 42, Range = 61