Keystones — Capstone
Five GCSE retrieval questions · 23 January 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 7x - 7
Answer: (x - 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 50°. Give your answer to 2 decimal places
Answer: 206.83cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 47, 80, 97, 93, 72, 47, 98
Answer: Mean = 68.5, Median = 76, Range = 84