Keystones — Capstone
Five GCSE retrieval questions · 12 December 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
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 = 21cm, b = 19cm, angle = 71°
Answer: 188.6cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 95, 43, 64, 51, 93, 71
Answer: Mean = 67, Median = 64, Range = 52