Keystones — Capstone
Five GCSE retrieval questions · 1 May 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² + 9x - 11
Answer: (x + 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 20cm, angle = 79°. Give your answer to 2 decimal places
Answer: 137.43cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 70, 89, 92, 79, 21, 12. Give your answer to 2 decimal places
Answer: Mean = 63.86, Median = 79, Range = 80