Keystones — Capstone
Five GCSE retrieval questions · 18 January 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√44
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 2
Answer: (x - 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 40°. Give your answer to 2 decimal places
Answer: 138.84cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 24:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 41, 84, 41, 76, 82, 76, 46. Give your answer to 2 decimal places
Answer: Mean = 58.38, Median = 61, Range = 63