For a complete lesson on percent increase, go to http://www.MathHelp.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to find the percent increase or percent decrease between two numbers, using the following formula: amount of change/ original number. For example, to find the percent decrease if the price changes from $60 to $39, since the amount of change is $21, and the original number is $60, the percent decrease is $21/$60, which simplifies to 0.35. And remember that the answer is a percent, so move the decimal point two places to the right, to get 35%. So if the price changes from $60 to $39, the percent decrease is 35%.
In this math lesson we explore how to increase or decrease an amount by a given percentage - through simple multiplication. The method for doing this type of percentage problem is as follows, where we find 35 increased by 20%. First we start with the whole amount - in this case 35. Percentages describe a number expressed as a fraction of 100, so as 35 is the whole amount it is 100% or 100/100 or 1. To take off 20% we are taking off 20/100 or 0.2 of this - so 1 - 0.2 = 0.8. 0.8 of 35 is the same as 0.8 x 35 = 28.0.
Math expert Marija Kero explains how to find a percentage change between two numbers. The equation is the same for either an increase or decrease, try on your own. Synonym Classroom provides clear and concise answers to common questions in Education, Math, Science, among other topics relevant to today's student and teacher. Visit: http://classroom.synonym.com/ for more information, articles, and answers.
Go to http://mathmotor.com/e-tutoring/ for LIVE online tutoring! Learn how to find the percent of change with this detailed and step by step video by Math Motor. This video shows you how to setup a simple ratio that can be used to find a percent increase and a percent decrease too! Life is too short.....so do yourself a favor and subscribe to Math Motor Channel and make Math easy everyday!