Keystones — Capstone
Five GCSE retrieval questions · 1 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² - 3x - 10
Answer: (x - 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 24cm, angle = 62°. Give your answer to 2 decimal places
Answer: 148.34cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 57, 56, 42, 67, 48, 92. Give your answer to 2 decimal places
Answer: Mean = 61.71, Median = 57, Range = 50