Keystones — Capstone
Five GCSE retrieval questions · 29 September 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 77°
Answer: 214.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 47, 40, 32, 10, 86, 17, 64
Answer: Mean = 47.1, Median = 47, Range = 76