Keystones — Capstone
Five GCSE retrieval questions · 15 January 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 10
Answer: (x + 5⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 64°. Give your answer to 2 decimal places
Answer: 237.73cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 53, 30, 56, 59, 11, 24, 17
Answer: Mean = 37, Median = 38, Range = 48