Keystones — Capstone
Five GCSE retrieval questions · 19 September 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 7
Answer: 4(x + 6)² - 151 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 51°. Give your answer to 2 decimal places
Answer: 116.18cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 21:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 72, 36, 80, 94, 65, 75, 60
Answer: Mean = 68.25, Median = 68.5, Range = 58