Keystones — Capstone
Five GCSE retrieval questions · 26 February 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - x + 8
Answer: (x - 1⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 77°. Give your answer to 2 decimal places
Answer: 328.85cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 12:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 52, 91, 72, 30, 29, 25
Answer: Mean = 51, Median = 52, Range = 66