Keystones — Capstone
Five GCSE retrieval questions · 10 June 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² + 5x - 6
Answer: (x + 5⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 59°. Give your answer to 2 decimal places
Answer: 246.44cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 62, 31, 57, 53, 98, 53. Give your answer to 2 decimal places
Answer: Mean = 53.14, Median = 53, Range = 80