Keystones — Capstone
Five GCSE retrieval questions · 14 January 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² - x - 8
Answer: (x - 1⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 25cm, angle = 57°. Give your answer to 2 decimal places
Answer: 125.8cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 28:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 11, 70, 36, 97, 73, 84, 33, 62. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 62, Range = 86