Keystones — Capstone
Five GCSE retrieval questions · 23 October 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 26cm, angle = 69°
Answer: 182cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 3:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 85, 37, 84, 12, 24, 96, 35, 54
Answer: Mean = 57.8, Median = 54, Range = 84