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July 25, 2014

July 25, 2014

Posted by **Teach3rdgraders** on Wednesday, September 22, 2010 at 10:30pm.

- 3rd grade math -
**Ms. Sue**, Wednesday, September 22, 2010 at 10:36pmHelp needed.

- 3rd grade -
**bobpursley**, Wednesday, September 22, 2010 at 10:38pmThe rule is to choose a near number that is easier to add. Rounding to nearest 5 will work.

For instance, add 3+17+21+12

using compatible numbers

5+15+20+10=50

The use of compatable numbers is an aid to doing arithmetic. It works not as good on multiplying and dividing, but it does give an estimate, but at 3rd grade, you are not there yet.

- 3rd grade -
**Teach3rdgraders**, Wednesday, September 22, 2010 at 10:44pmThank you so much. Just adding two digit numbers and in the book there is only one sentence about compatable numbers and wanted to further understand how to teach it to the students since it is in our State Curriculum for third graders to know (TEKS). 683+52 ----I tell the students 685 will be compatable to 683 and 50 will be compatable to 52 and then add 685+50 = 735.

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