Keystones — Capstone
Five GCSE retrieval questions · 10 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² + 11x + 6
Answer: (x + 11⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 22cm, angle = 77°. Give your answer to 2 decimal places
Answer: 267.95cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 63:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 35, 63, 30, 45, 54, 58, 18, 89. Give your answer to 2 decimal places
Answer: Mean = 53.78, Median = 54, Range = 74