Keystones — Capstone
Five GCSE retrieval questions · 4 February 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
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 = 15cm, b = 20cm, angle = 68°
Answer: 139.cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 6:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 82, 67, 31, 94, 42, 40
Answer: Mean = 58, Median = 50, Range = 63