Keystones — Capstone
Five GCSE retrieval questions · 15 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 4
Answer: 5(x + 2)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 27cm, angle = 70°. Give your answer to 2 decimal places
Answer: 177.6cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 4:28:63 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 56, 94, 21, 99, 97, 10
Answer: Mean = 64, Median = 71, Range = 89