Keystones — Capstone
Five GCSE retrieval questions · 11 September 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + 7x
Answer: (x + 7⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 59°. Give your answer to 2 decimal places
Answer: 192.86cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 89, 53, 63, 32, 92, 47, 14, 33. Give your answer to 2 decimal places
Answer: Mean = 52.44, Median = 49, Range = 78