Keystones — Capstone
Five GCSE retrieval questions · 12 January 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 5x² + 50x - 9
Answer: 5(x + 5)² - 134 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 52°. Give your answer to 2 decimal places
Answer: 187.55cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 3:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 82, 26, 59, 36, 72, 67, 90. Give your answer to 2 decimal places
Answer: Mean = 56.13, Median = 63, Range = 73