Keystones — Capstone
Five GCSE retrieval questions · 10 May 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 11
Answer: (x + 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 16cm, angle = 55°. Give your answer to 2 decimal places
Answer: 111.4cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 56:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 30, 52, 22, 78, 64, 35. Give your answer to 2 decimal places
Answer: Mean = 44.29, Median = 35, Range = 56