Keystones — Capstone
Five GCSE retrieval questions · 6 August 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 5x - 9
Answer: (x - 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 14cm, angle = 52°. Give your answer to 2 decimal places
Answer: 66.19cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 86, 56, 79, 87, 71, 75, 10
Answer: Mean = 68.75, Median = 77, Range = 77