Keystones — Capstone
Five GCSE retrieval questions · 1 November 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - x - 6
Answer: (x - 1⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 42°. Give your answer to 2 decimal places
Answer: 216.8cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 86, 18, 70, 13, 30, 42. Give your answer to 2 decimal places
Answer: Mean = 48.57, Median = 42, Range = 73