Keystones — Capstone
Five GCSE retrieval questions · 26 June 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² - x + 11
Answer: (x - 1⁄2)² + 43⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 20cm, angle = 52°. Give your answer to 2 decimal places
Answer: 173.36cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 14:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 93, 10, 73, 31, 13, 21, 99. Give your answer to 2 decimal places
Answer: Mean = 44.38, Median = 26, Range = 89