Keystones — Capstone
Five GCSE retrieval questions · 7 July 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 9x + 12
Answer: (x + 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 54°. Give your answer to 2 decimal places
Answer: 218.43cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 64:72:63 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 75, 47, 62, 30, 68, 58
Answer: Mean = 52, Median = 58, Range = 51