Year 9 Percentages: calculate percentage change | Teaching Resources
Percent Increase Calculator - Find Percentage Increase - Inch Calculator
Calculating Percent Increase in 3 Easy Steps — Mashup Math
Corbettmaths on Twitter: "Percentage Change: you may be asked to calculate percentage increase/decrease etc http://t.co/A0xEOnea1b http://t.co/PqB5VUO37K" / Twitter
Calculate percentage increase and decrease
How to Calculate Percentage Increase in Excel (The Right Way) - YouTube
How to work out a percentage original value before percentage decrease - BBC Bitesize