Keystones — Capstone
Five GCSE retrieval questions · 12 October 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 10
Answer: 2(x + 5)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 70°. Give your answer to 2 decimal places
Answer: 119.81cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:24:32 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 76, 16, 61, 100, 10, 99, 15, 83. Give your answer to 2 decimal places
Answer: Mean = 57.89, Median = 61, Range = 90