Keystones — Capstone
Five GCSE retrieval questions · 7 January 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 9
Answer: 4(x - 5)² - 109 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 70°. Give your answer to 2 decimal places
Answer: 177.6cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:30:18 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 74, 63, 21, 80, 84, 82
Answer: Mean = 70, Median = 80, Range = 65