Keystones — Capstone
Five GCSE retrieval questions · 30 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 10
Answer: 5(x + 3)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 16cm, angle = 80°. Give your answer to 2 decimal places
Answer: 220.6cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 40:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 94, 12, 71, 75, 77, 13, 94
Answer: Mean = 60.75, Median = 73, Range = 82