Keystones — Capstone
Five GCSE retrieval questions · 24 March 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + 5x - 1
Answer: (x + 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 53°. Give your answer to 2 decimal places
Answer: 119.8cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 48:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 89, 46, 91, 84, 97, 94, 100
Answer: Mean = 84.25, Median = 90, Range = 54