Keystones — Capstone
Five GCSE retrieval questions · 21 February 2019 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 72°
Answer: 180.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 14, 64, 94, 74, 67, 41, 48
Answer: Mean = 59, Median = 67, Range = 80