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
girls=8
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

e.g.

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

3. arianna

5x5=25

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.

Edwin

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.

:D

15. Derick

25-9=16 boys. the rest are girls

16. Emma

there are 16 girls

17. jeniah

students=25
boys=25-9=16
boys & girls=16
girls=16 divided 2=8
boys=8+9=17
girls=8

18. sienna

15

19. renee

how many apples can you dived by 60
in 10 mients

20. Kaylee

30

21. Zayn

Just explain how to use X for him.

22. emaan

16

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