Keystones — Capstone
Five GCSE retrieval questions · 1 January 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 49°. Give your answer to 2 decimal places
Answer: 190.19cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 20:35:49 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 83, 93, 17, 72, 45, 49, 72, 20. Give your answer to 2 decimal places
Answer: Mean = 52.11, Median = 49, Range = 76