Keystones — Capstone
Five GCSE retrieval questions · 7 August 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 15
Answer: 4(x + 3)² - 21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 41°. Give your answer to 2 decimal places
Answer: 137.12cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 55, 56, 55, 49, 92, 53. Give your answer to 2 decimal places
Answer: Mean = 58.43, Median = 55, Range = 43