Fractions+Addition_Subtraction

Adding
When adding of subtracting fractions you must have the denominators the same. The denominators are not always the same in the origanal problem and you have to make them the same. To do this you have to find the //least common denominator// (LCD). Lets say that we wanted to add 1/2 and 4/5 together, first we have to make the denominators the same by finding their LCD. Ex .  2: 2,4,6,8,10 __5: 5,__10__  Then we change the fractions tho have the denominator of 10. The way you do this is that we took 2 and multipled it by 5,so we take 1 and multiply it by 5 and get 5. This fraction becomes 5/10. We then do the same thing with 4/5 and get 8/10. The next step is just to add them. Ex. 5/10 + 8/10= 13/10 The final step is to turn the answer from an improper fraction to a proper fraction. To do this we divide the numerator by the denominator. We divide 13 by 10 and we get 1 with 3 leftovers so the answer is 1 and 3/10.

Now try out these problems Easy Problems 1/3 + 4/6= ? 1/4 + 3/8= ? 7/10 + 2/5= ? 4/6 + 8/12= ?

Medium Problems 3/4 + 7/16= ? 5/9 + 55/72= ? 4/7 + 43/49= ? 3/18 + 4/9= ?

Hard Problems 9/23 + 17/24 = ? 7/24 + 2/20 = ? 5/8 + 3/9= ? 6/25 + 1/2= ?

Subtracting
To subtract fractions you do the same thing as when you add the. You have to make the denominators the same and only subtract the numerators. Ex. 3/5=6/10 9/10=9/10 9/10 - 6/10=3/10

Why do you not add or subtract the Denominator?
The denominator tells you how many pieces the whole is divided into. If you were to add or subtract the denominators the number of pieces the whole is divided into will change so you only add or subtract the numerators**R**.

For more on adding and subtracting fractions check out these sites.
[] [|4creative.wordpress.com/.../] [|www.utc.edu/.../DP2RaquelNewton.htm] []
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media type="custom" key="3761217"Subtracting Fractions (Online Video) [|www.mathtrain.com] 5/6/09

media type="custom" key="3751087"Adding Fractions (online video) www.yourteacher.com 5/4/09

media type="custom" key="3780547"Turning Fractions into Decimals (online video) [|www.mathtrain.com] 5/9/09

media type="custom" key="3780565"Subtracting Fractions (online video) [|www.mathtrain.com] 5/9/09 Fractions (online image) [|www.kingphilip.com] 5/8/09

When using larger fractions you can simplifly tthem into smaller fractions such as.. 5/10 = 1/2

Pi...sort of (online image) i-know.org 5/8/09

A fraction problem (online image) moodle.cksd.wednet.edu 5/8/09

So so small (online image) [|www.cartoonstock.com] 5/8/09 (online image) [|commons.wikimedia.org]5/22/09

Answer Key Addition Easy 1/3 + 4/6 = 6/6= 1 1/4 + 3/8= 5/8 7/10 + 2/5= 11/10= 1 1/10 4/6 + 8/12= 16/12= 1 4/12

Medium 3/4 + 7/16= 19/16= 1 3/16 5/9 + 55/72= 95/72= 1 23/72