Keystones — Capstone
Five GCSE retrieval questions · 18 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 14
Answer: 3(x + 2)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 70°. Give your answer to 2 decimal places
Answer: 246.67cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 18:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 98, 64, 61, 86, 22, 61. Give your answer to 2 decimal places
Answer: Mean = 57.71, Median = 61, Range = 86