Keystones — Capstone
Five GCSE retrieval questions · 5 March 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² + 3x + 5
Answer: (x + 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 77°. Give your answer to 2 decimal places
Answer: 214.36cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 12:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 31, 66, 25, 58, 50, 42. Give your answer to 2 decimal places
Answer: Mean = 47.29, Median = 50, Range = 41