Keystones — Capstone
Five GCSE retrieval questions · 19 February 2019 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 15cm, angle = 52°
Answer: 177.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 11, 58, 62, 84, 73, 25, 44, 92
Answer: Mean = 54.1, Median = 58, Range = 81