Keystones — Capstone
Five GCSE retrieval questions · 23 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√250
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - 7x - 1
Answer: (x - 7⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 22cm, angle = 78°. Give your answer to 2 decimal places
Answer: 129.12cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 25:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 18, 29, 10, 39, 65, 100. Give your answer to 2 decimal places
Answer: Mean = 42.57, Median = 37, Range = 90