Pre-Algebra: Cross Multiplication Help

This page is for pre-algebra students who need help, and for teachers and tutors who are looking for resources on cross multiplication.

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Pre-Algebra: Cross Multiplication

In mathematics, the rule of three is the method of finding the fourth term of a mathematical proportion when the first three terms are known, that is, where the first term is in proportion to the second as the third is to the unknown fourth term.

To find the fourth term, multiply the second and third terms, then divide their product by the first term.
 
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At TuLyn, we have over 2000 math video tutorial clips including cross multiplication videos, cross multiplication practice word problems, cross multiplication questions and answers, and cross multiplication worksheets.

Our cross multiplication videos replace text-based tutorials and give you better step-by-step explanations of cross multiplication. Watch each video repeatedly until you understand how to approach cross multiplication problems and how to solve them.
  • Hundreds of video tutorials on cross multiplication make it easy for you to better understand the concept.
  • Hundreds of word problems on cross multiplication give you all the practice you need.
  • Hundreds of printable worksheets on cross multiplication let you practice what you have learned by watching the video tutorials.
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Pre-Algebra: Cross Multiplication Videos

Solving Equations Requiring Cross Multiplication
Video Clip Length: 2 minutes 42 seconds
Video Clip Views: 24668

This tutorial will show you how to perform you cross multiplication to solve for x.  You need to use distributive property and also solve for the equation.

cross multiplication, equations, solving equations
Solving Fractional Equations
Video Clip Length: 4 minutes 12 seconds
Video Clip Views: 20777

In this tutorial, you will learn how to solve equations with fractions.  Notice we have fractions on both sides of the equation.  We need to get q divided by 3 by itself, so next step should be to combine the whole number and fraction.  After that we can simply set up a cross multiplication equation in order to get q by itself.

cross multiplication, equations, fractional equations, solving equations, solving fractional equations
Solving Equations Requiring Cross Multiplication 3
Video Clip Length: 3 minutes 31 seconds
Video Clip Views: 14215

This tutorial is going to show you how to solve fractional equations.  We will use cross multiplication in order to solve for x, the missing variable.

cross multiplication, equations, solving equations
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Pre-Algebra: Cross Multiplication Word Problems

If 35 grams of pure drug are contained
If 35 grams of pure drug are contained in 150 ...
Michele`s property insurance on her home
Michele's property insurance on her home was canceled by the insurance company after a period of 315 days. What would be her regular refund if the annual premium were 385 ...
Cross Multiplication
Bill Clinton is worth 28 billion dollars! This is a difficult number to really understand, so to help us out, if Bill Clinton buys a $150,000 car it is similar to the "average" Amercian spending 45 cents for a pack of ...
See All Cross Multiplication Worksheets

Pre-Algebra: Cross Multiplication Practice Questions

2/9x=5
5/10=6/x
3x+6     2x-18
          =
  35          5

can u think of something else than cross multiplcation
May 12, 2009, 5:44 pm

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Its explained very nicely and the lessons are not taught too quickly! I hope that this site can be of a great help to me and I am hoping that it helps me excel, catch up with all of the other smart ass students and achieve better grades on my tests, that I barely just pass by :) I need help with cross multiplication and also word/ratio problems...

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This Pre-Algebra page lists video tutorials, worksheets and word problems on cross multiplication topic.