Keystones — Capstone
Five GCSE retrieval questions · 22 February 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² - x - 6
Answer: (x - 1⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 52°. Give your answer to 2 decimal places
Answer: 190.3cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 27:24:8 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 22, 33, 37, 67, 53, 55, 87, 96. Give your answer to 2 decimal places
Answer: Mean = 57.67, Median = 55, Range = 74