Keystones — Capstone
Five GCSE retrieval questions · 20 October 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 7
Answer: 4(x + 4)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 21cm, angle = 48°. Give your answer to 2 decimal places
Answer: 171.67cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 9:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 28, 49, 50, 21, 17, 93
Answer: Mean = 44, Median = 49, Range = 76