Keystones — Capstone
Five GCSE retrieval questions · 10 December 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 52°. Give your answer to 2 decimal places
Answer: 132.39cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 8:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 50, 10, 40, 55, 53, 72, 90, 19
Answer: Mean = 45, Median = 50, Range = 80