Keystones — Capstone
Five GCSE retrieval questions · 23 February 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 12cm, angle = 76°. Give your answer to 2 decimal places
Answer: 174.65cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 97, 37, 28, 75, 36, 77, 16, 28. Give your answer to 2 decimal places
Answer: Mean = 45.33, Median = 36, Range = 83