Keystones — Capstone
Five GCSE retrieval questions · 25 April 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 26cm, angle = 71°
Answer: 196.7cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 88, 27, 13, 45, 69, 92, 53
Answer: Mean = 50.8, Median = 53, Range = 79