Keystones — Capstone
Five GCSE retrieval questions · 22 February 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 14
Answer: 3(x + 3)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 71°. Give your answer to 2 decimal places
Answer: 397.12cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 14, 55, 83, 80, 98, 38, 100, 32. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 55, Range = 86