Keystones — Capstone
Five GCSE retrieval questions · 30 April 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 55°
Answer: 190cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:5. Find a:b:c.
Answer: 3:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 94, 38, 87, 68, 96, 19, 63, 95
Answer: Mean = 71.1, Median = 80, Range = 77