Keystones — Capstone
Five GCSE retrieval questions · 28 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 6
Answer: 5(x + 5)² - 119 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 17cm, angle = 44°. Give your answer to 2 decimal places
Answer: 94.47cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 9:24:16 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 91, 31, 43, 77, 83, 49, 64, 98. Give your answer to 2 decimal places
Answer: Mean = 62.89, Median = 64, Range = 68