Keystones — Capstone
Five GCSE retrieval questions · 22 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 12
Answer: 5(x - 4)² - 92 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 73°. Give your answer to 2 decimal places
Answer: 218.04cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 12:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 53, 57, 93, 11, 49, 38, 41. Give your answer to 2 decimal places
Answer: Mean = 50.38, Median = 51, Range = 82