Keystones — Capstone
Five GCSE retrieval questions · 20 March 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 11
Answer: (x - 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 48°. Give your answer to 2 decimal places
Answer: 150.86cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 65, 85, 70, 77, 72, 95, 34, 48. Give your answer to 2 decimal places
Answer: Mean = 71.22, Median = 72, Range = 61