Keystones — Capstone
Five GCSE retrieval questions · 18 June 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: x² - 9x - 2
Answer: (x - 9⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 66°. Give your answer to 2 decimal places
Answer: 116.48cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 36:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 36, 12, 95, 34, 100, 18, 42, 92
Answer: Mean = 50, Median = 36, Range = 88