Keystones — Capstone
Five GCSE retrieval questions · 29 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√250
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: x² - 7x + 9
Answer: (x - 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 48°. Give your answer to 2 decimal places
Answer: 135.25cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 10:45:63 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 62, 44, 24, 98, 11, 20, 18
Answer: Mean = 45.25, Median = 34, Range = 87