Keystones — Capstone
Five GCSE retrieval questions · 13 December 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 52°. Give your answer to 2 decimal places
Answer: 253.74cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 19, 83, 80, 50, 29, 94, 99
Answer: Mean = 67, Median = 81, Range = 80