Keystones — Capstone
Five GCSE retrieval questions · 20 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 4
Answer: 4(x + 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 26cm, angle = 65°. Give your answer to 2 decimal places
Answer: 188.51cm² -
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: 50, 43, 29, 87, 61, 54, 44, 83, 85. Give your answer to 2 decimal places
Answer: Mean = 59.56, Median = 54, Range = 58