Keystones — Capstone
Five GCSE retrieval questions · 17 June 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 16cm, angle = 76°. Give your answer to 2 decimal places
Answer: 124.2cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 2:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 42, 43, 64, 14, 23, 62. Give your answer to 2 decimal places
Answer: Mean = 38.71, Median = 42, Range = 50