Homework Help: 3rd Grade Math

Posted by Lisa on Tuesday, October 2, 2012 at 5:57pm.

There are 25 students in Mrs. Roberts 3rd grade class. There are 9 more boys than girls in the class. How many boys and girls are in Mrs. Robert's class?

How can I explain this to my 8yr old in 3rd grade? I've got myself so confused in the process of trying to figure it out that I'm now lost as well.

3rd Grade Math - bobpursley, Tuesday, October 2, 2012 at 6:02pm
Boys and girls=25
but boys is girls+9

so girls+9+girls=25
twice girls+9=25
twice girls=16
girls=8
boys=nine plus eight
3rd Grade Math - Reiny, Tuesday, October 2, 2012 at 6:08pm
Ahhh, this would be so easy with algebra as was shown by Ms Sue and Shelley, but I guess we can't use algebra for a grade 3

How about making two columns where the two numbers add up to 25 until we see a difference of 9

e.g.

10 15 ----> difference is 5
9 16 ----> difference is 7
8 17 ----> difference is 9 , YEaaahh!

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