Keystones — Capstone
Five GCSE retrieval questions · 11 July 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + 9x + 1
Answer: (x + 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 23cm, angle = 73°. Give your answer to 2 decimal places
Answer: 263.94cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 53, 37, 55, 40, 78, 45, 74, 96. Give your answer to 2 decimal places
Answer: Mean = 62.89, Median = 55, Range = 59