## Monday, November 18, 2013

### Equivalent Fractions

MCC4.NF.1 Explain why a fraction a/b is equivalent to a fraction (n × a)/(n × b) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size. Use this principle to recognize and generate equivalent fractions.

How can we find equivalent fractions?

* Using number lines
http://learnzillion.com/lessons/617-recognize-equivalent-fractions-using-number-lines
Video demonstrating how to use number lines to find equivalent fractions.

*Using visual Models
Find an equivalent fraction to 1/4.
The denominator (4) tells you how many pieces to circle in each group.
The numerator (1) tells you how many pieces to shade in each group.
In the shape below, you would circle groups of 4. This will give you 4 groups. You will then shade 1 out of each group. You will have a total of 3 shaded, because you have three groups. That makes your equivalent fraction 3/12.

* Multiplying across
Equivalent Fractions MUST be Fair!!!
Whatever you do to the numerator, you must do to the denominator.

3  =   9
4        ?
You multiply 3 by 3 to get 9. Since you multiplied the numerator by 3, you must multiply the denominator by 3 as well. 4 x 3 = 12. So the new denominator will be 12. Your equivalent fractions are 3/4 and 9/12.

*Check your work by cross multiplying.

http://studyjams.scholastic.com/studyjams/jams/math/fractions/equiv-fractions.htm
Studyjams video on equivalent fractions

http://www.mathplayground.com/Triplets/Triplets.html
Triplets game from Math playground

http://www.sheppardsoftware.com/mathgames/fractions/memory_equivalent1.htm
Matching equivalent fractions

http://pbskids.org/cyberchase/math-games/melvins-make-match/
Fraction game

http://www.softschools.com/math/fractions/equivalent_fractions/games/
Equivalent Fractions Quiz

http://illuminations.nctm.org/Activity.aspx?id=3510
Creating Equivalent Fractions

http://mrnussbaum.com/fractiondolphins/
Fraction dolphin game