3rd Grade Math

posted by Lisa

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.

  1. bobpursley

    Boys and girls=25
    but boys is girls+9

    so girls+9+girls=25
    twice girls+9=25
    twice girls=16
    boys=nine plus eight

  2. Reiny

    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


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

  3. arianna


  4. Gianna

    I don't understand?

  5. Edwin

    Suppose the teacher says to the class:

    "We're going to play a game and to play it we must have exactly the same number of boys as we have girls. So 9 of you boys will have to go to another room while we play this game."

    So 9 boys get up and leave the room. That leaves 25-9 or 16 students in the room, 8 girls and 8 boys. Then after the game is over the 9 boys return. Now there are 8 girls and 8+9 or 17 boys.


  6. tanzia

    20 tiles in 5 rows

  7. samikchya

    solve a simpler problem

  8. Jaszmine

    You can tell her to subtract. Enjoy

  9. Elina

    get out 25 blocks then pull 9

  10. melissa

    title is class collection data week 1

  11. Anonymous

    Use structure what property of addition is showmen in the following number sentence ?explain.7+(3+5)=(7+3)+5

  12. Aleyna

    Use Trial and error

    5+14=19. No

  13. Angel

    Its too hard

  14. Krista

    Start with the idea that some of the students can be paired (boy/girl, boy/girl, boy/girl...

    Then ask what (or who) will be left over after the pairing.... 9 boys. So have the child set the 9 boys apart... so instead of pairing 25 students we'll pair....be sure to ask the question rather than just tell... Most 8yr-olds will be able to figure out the equation required is 25-9=16. Help only as needed.

    Now we have 16 students that we are going to pair boy/girl, boy/girl... How many pairs. So, with only what prompting is needed, that's how many girls? How many boys? May need a reminder about the 9 set aside before.

    Students adds the 8 paired boys with the 9 stag boys = 17. 8 girls. Double check that the boys + girls adds up to the 25...

    Yeah! Math isn't so terrible after all.


  15. Derick

    25-9=16 boys. the rest are girls

  16. Emma

    there are 16 girls

  17. jeniah

    boys & girls=16
    girls=16 divided 2=8
    make sure your answer is correct:17+8=25

  18. sienna


  19. renee

    how many apples can you dived by 60
    in 10 mients

  20. Kaylee


  21. Zayn

    Just explain how to use X for him.

  22. emaan


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