Keystones — Capstone
Five GCSE retrieval questions · 2 September 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 68°. Give your answer to 2 decimal places
Answer: 361.6cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 63:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 90, 45, 71, 54, 61, 10. Give your answer to 2 decimal places
Answer: Mean = 50.29, Median = 54, Range = 80