Keystones — Capstone
Five GCSE retrieval questions · 13 July 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 50°
Answer: 141cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:5. Find a:b:c.
Answer: 8:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 43, 15, 27, 26, 83, 88, 71, 99
Answer: Mean = 53.9, Median = 43, Range = 84