Keystones — Capstone
Five GCSE retrieval questions · 7 July 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 14
Answer: 3(x + 3)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 20cm, angle = 73°. Give your answer to 2 decimal places
Answer: 153.01cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 63:28:36 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 69, 41, 44, 53, 64, 90, 77
Answer: Mean = 66.25, Median = 66.5, Range = 51