Keystones — Capstone
Five GCSE retrieval questions · 11 May 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 12cm, angle = 40°
Answer: 61.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:5. Find a:b:c.
Answer: 6:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 82, 84, 94, 62, 71, 46
Answer: Mean = 73.4, Median = 75, Range = 48