Keystones — Capstone
Five GCSE retrieval questions · 2 February 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 10
Answer: 3(x + 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 19cm, angle = 61°. Give your answer to 2 decimal places
Answer: 132.94cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 87, 57, 24, 39, 45, 81, 72. Give your answer to 2 decimal places
Answer: Mean = 52.88, Median = 51, Range = 69