Keystones — Capstone
Five GCSE retrieval questions · 21 December 2015 · 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 - 11x + 3
Answer: (x - 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 19cm, angle = 48°. Give your answer to 2 decimal places
Answer: 155.32cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 21:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 57, 74, 99, 51, 47, 73. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 69, Range = 52