Keystones — Capstone
Five GCSE retrieval questions · 15 July 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√175
Answer: 25√7 -
2. Algebra Completing the square
Complete the square: x² - x + 2
Answer: (x - 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 56°. Give your answer to 2 decimal places
Answer: 80.83cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 27:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 92, 29, 40, 73, 38, 95
Answer: Mean = 64, Median = 73, Range = 66