Keystones — Capstone
Five GCSE retrieval questions · 29 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 5
Answer: 5(x - 3)² - 50 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 253.85cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 28:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 33, 57, 82, 78, 79, 72, 37, 70. Give your answer to 2 decimal places
Answer: Mean = 65.11, Median = 72, Range = 49