Keystones — Capstone
Five GCSE retrieval questions · 21 January 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√150
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 8
Answer: (x - 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 62°. Give your answer to 2 decimal places
Answer: 309.91cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 81, 98, 27, 79, 51, 38. Give your answer to 2 decimal places
Answer: Mean = 57.14, Median = 51, Range = 72