Keystones — Capstone
Five GCSE retrieval questions · 10 October 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: x² - 7x - 8
Answer: (x - 7⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 15cm, angle = 72°. Give your answer to 2 decimal places
Answer: 192.59cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 14:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 51, 20, 71, 65, 45, 13
Answer: Mean = 43, Median = 45, Range = 58