Posted by **ttuuffyy** on Thursday, March 14, 2013 at 5:09pm.

Annie walked her dog 2 1/4 miles from her house to the dog park and 3/7/8 miles around the park.Then she walked the same distance home.How many miles did she walk in all?

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**Ms. Sue**, Thursday, March 14, 2013 at 5:12pm
2 2/8 + 3 7/8 = 5 9/8 = 6 1/8 mile

6 1/8 + 6 1/8 = ?

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**ttuuffyy**, Thursday, March 14, 2013 at 5:16pm
How did you figure that out.Iam trying to explain to my 4 th grader

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**Ms. Sue**, Thursday, March 14, 2013 at 5:20pm
When we add or subtract fractions, we must have a common denonimator.

2 1/4 = 2 2/8

When I added the two fractions, I added the whole numbers and the numerators. That is 5 9/8. But since 9/8 is larger than 1, I simplified the fraction to 6 1/8.

Which part doesn't the child understand?

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**ttuuffyy**, Thursday, March 14, 2013 at 5:22pm
9/8 when you simplified it.

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**Ms. Sue**, Thursday, March 14, 2013 at 5:27pm
If you divide two pizzas into 8ths, you have 8 in one pizza and 8 in the other pizza. 9/8 is all of the pieces in one plus one piece from the other.

You might draw a picture for the child showing the two pizzas.

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