Keystones — Capstone
Five GCSE retrieval questions · 25 November 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√63
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - x + 2
Answer: (x - 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 57°. Give your answer to 2 decimal places
Answer: 152.64cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 45:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 70, 16, 21, 15, 32, 39. Give your answer to 2 decimal places
Answer: Mean = 29.57, Median = 21, Range = 56