Keystones — Capstone
Five GCSE retrieval questions · 24 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 15
Answer: 5(x - 1)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 15cm, angle = 74°. Give your answer to 2 decimal places
Answer: 209.07cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 24:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 47, 50, 30, 18, 78, 23, 12
Answer: Mean = 43.25, Median = 38.5, Range = 76