Keystones — Capstone
Five GCSE retrieval questions · 5 March 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² + 7x + 8
Answer: (x + 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 53°. Give your answer to 2 decimal places
Answer: 134.17cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 94, 87, 14, 20, 43, 24, 50. Give your answer to 2 decimal places
Answer: Mean = 44.13, Median = 33.5, Range = 80