Keystones — Capstone
Five GCSE retrieval questions · 29 March 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 6
Answer: (x + 5⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 76°. Give your answer to 2 decimal places
Answer: 169.8cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 14:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 48, 37, 88, 73, 90, 32. Give your answer to 2 decimal places
Answer: Mean = 61.43, Median = 62, Range = 58