Keystones — Capstone
Five GCSE retrieval questions · 26 January 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² + x + 4
Answer: (x + 1⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 16cm, angle = 56°. Give your answer to 2 decimal places
Answer: 126.01cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 73, 49, 83, 87, 74, 53, 70. Give your answer to 2 decimal places
Answer: Mean = 69.63, Median = 71.5, Range = 38