Posted by **rodrick** on Friday, October 10, 2008 at 5:29pm.

how do you tell what compatible numbers you would use and theh add example $2.75+$5.35

- 3rd grade math -
**drwls**, Friday, October 10, 2008 at 5:35pm
I never heard of "compatible numbers".

Just add them, keep the decimal point in the same place, and you get $8.10

- 3rd grade math -
**fithgrader**, Sunday, October 12, 2008 at 8:41am
the answer is 8.10 you get this because if yo add.05+.05 it would =.10 so you carry the 1 to the tenths place and then add .70+.30 and then add .10 because that is the answer for the hunthenths place and then it would be.10. Then you add 2+5 then add .10 and you wouled get 8.10

- 3rd grade math -
**Mother of a 3rd Grader**, Tuesday, October 28, 2008 at 12:05am
Compatible numbers are numbers that are easy to compute mentally

- 3rd grade math -
**phat**, Thursday, September 9, 2010 at 5:28pm
tell what compatible numbers you would use.then add

$2.55+$1.34

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- 3rd grade math -
**Anonymous**, Tuesday, September 21, 2010 at 12:18pm
300

+100

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400

answer: 400

- 3rd grade math -
**Teach3rdgraders**, Wednesday, September 22, 2010 at 10:14pm
What is your question Anonymous? What it looks like is that you rounded. 300+100 = 400 is correct.

- 3rd grade math -
**Amia**, Wednesday, August 24, 2011 at 9:32pm
Compatible 67+ 119

- 3rd grade math -
**Khayla**, Monday, October 14, 2013 at 9:42pm
Tell what compatible numbers you would use then add 419+263

- 3rd grade math -
**Anonymous**, Thursday, January 8, 2015 at 8:11pm
186

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