Keystones — Capstone
Five GCSE retrieval questions · 27 April 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 13cm, angle = 48°
Answer: 101.4cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 12, 53, 36, 88, 50, 99, 34
Answer: Mean = 53, Median = 52, Range = 87