Keystones — Capstone
Five GCSE retrieval questions · 14 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 10
Answer: 3(x - 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 70°. Give your answer to 2 decimal places
Answer: 368.36cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 28:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 41, 91, 87, 57, 34, 72, 99. Give your answer to 2 decimal places
Answer: Mean = 69.38, Median = 73, Range = 65