Keystones — Capstone
Five GCSE retrieval questions · 20 December 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 1
Answer: 4(x - 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 53°. Give your answer to 2 decimal places
Answer: 153.34cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 20, 89, 27, 31, 22, 13, 62, 72. Give your answer to 2 decimal places
Answer: Mean = 43.56, Median = 31, Range = 76