Keystones — Capstone
Five GCSE retrieval questions · 15 December 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: x² - x + 5
Answer: (x - 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 30cm, angle = 64°. Give your answer to 2 decimal places
Answer: 404.46cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 72, 52, 70, 45, 57, 55, 57, 10. Give your answer to 2 decimal places
Answer: Mean = 55.67, Median = 57, Range = 73