Keystones — Capstone
Five GCSE retrieval questions · 3 November 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 5
Answer: 3(x + 3)² - 32 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 57°. Give your answer to 2 decimal places
Answer: 184.51cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 4:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 15, 54, 36, 44, 97, 62, 84, 93. Give your answer to 2 decimal places
Answer: Mean = 64.56, Median = 62, Range = 82