Keystones — Capstone
Five GCSE retrieval questions · 3 December 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 7
Answer: (x + 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 21cm, angle = 77°. Give your answer to 2 decimal places
Answer: 286.46cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 66, 46, 39, 61, 75, 97, 26, 70
Answer: Mean = 63, Median = 66, Range = 71