Keystones — Capstone
Five GCSE retrieval questions · 4 May 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√27
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² + x + 3
Answer: (x + 1⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 13cm, angle = 57°. Give your answer to 2 decimal places
Answer: 114.48cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 10:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 87, 59, 91, 44, 46, 34, 13, 23. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 46, Range = 79