Keystones — Capstone
Five GCSE retrieval questions · 9 August 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 8
Answer: 4(x - 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 43°. Give your answer to 2 decimal places
Answer: 107.41cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 40:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 74, 77, 34, 90, 42, 89. Give your answer to 2 decimal places
Answer: Mean = 71.14, Median = 77, Range = 58