Keystones — Capstone
Five GCSE retrieval questions · 21 October 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + 11x - 11
Answer: (x + 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 57°. Give your answer to 2 decimal places
Answer: 207.15cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 64, 43, 48, 96, 71, 43, 58, 92. Give your answer to 2 decimal places
Answer: Mean = 64.33, Median = 64, Range = 53