Keystones — Capstone
Five GCSE retrieval questions · 12 June 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 5
Answer: 2(x + 3)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 57°. Give your answer to 2 decimal places
Answer: 94.35cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 4:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 85, 68, 10, 63, 97, 49, 71
Answer: Mean = 66.75, Median = 69.5, Range = 87