Keystones — Capstone
Five GCSE retrieval questions · 13 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 10
Answer: 2(x + 4)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 22cm, angle = 52°. Give your answer to 2 decimal places
Answer: 216.7cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:56:40 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 34, 51, 90, 99, 64, 39. Give your answer to 2 decimal places
Answer: Mean = 55.71, Median = 51, Range = 86