3rd Grade Math

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. 0
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  3. 9
asked by Lisa
  1. 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

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    posted by bobpursley
  2. 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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    posted by Reiny
  3. 5x5=25

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    posted by arianna
  4. I don't understand?

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    posted by Gianna
  5. 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.

    Edwin

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    posted by Edwin
  6. 20 tiles in 5 rows

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    posted by tanzia
  7. solve a simpler problem

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    posted by samikchya
  8. You can tell her to subtract. Enjoy

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    posted by Jaszmine
  9. get out 25 blocks then pull 9

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    posted by Elina
  10. title is class collection data week 1

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

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    posted by Anonymous
  12. Use Trial and error

    5+14=19. No

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    posted by Aleyna
  13. Its too hard

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    posted by Angel
  14. 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.

    :D

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    posted by Krista
  15. 25-9=16 boys. the rest are girls

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    posted by Derick
  16. there are 16 girls

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    posted by Emma
  17. students=25
    boys=25-9=16
    boys & girls=16
    girls=16 divided 2=8
    boys=8+9=17
    girls=8
    make sure your answer is correct:17+8=25

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    posted by jeniah
  18. 15

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    posted by sienna
  19. how many apples can you dived by 60
    in 10 mients

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    posted by renee
  20. 30

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    posted by Kaylee
  21. Just explain how to use X for him.

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    posted by Zayn
  22. 16

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    posted by emaan

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