Keystones — Capstone
Five GCSE retrieval questions · 27 December 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 47°
Answer: 210.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:5. Find a:b:c.
Answer: 2:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 54, 31, 26, 62, 17, 38, 60
Answer: Mean = 42.8, Median = 54, Range = 45