Keystones — Capstone
Five GCSE retrieval questions · 11 April 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 49°
Answer: 128.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 3:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 17, 27, 83, 64, 79, 36, 33
Answer: Mean = 50.4, Median = 64, Range = 66