Keystones — Capstone
Five GCSE retrieval questions · 25 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 12
Answer: 2(x + 1)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 14cm, angle = 78°. Give your answer to 2 decimal places
Answer: 143.79cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 15:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 95, 25, 77, 43, 48, 79, 28, 61. Give your answer to 2 decimal places
Answer: Mean = 57.44, Median = 61, Range = 70