Keystones — Capstone
Five GCSE retrieval questions · 17 May 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 44°
Answer: 118.8cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 23, 17, 40, 87, 59, 24, 37
Answer: Mean = 47.4, Median = 40, Range = 75