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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.

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

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!

5x5=25

I don't understand?

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

20 tiles in 5 rows

solve a simpler problem

You can tell her to subtract. Enjoy

get out 25 blocks then pull 9

title is class collection data week 1

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

Use Trial and error

5+14=19. No

Its too hard

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

25-9=16 boys. the rest are girls

there are 16 girls

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

15

how many apples can you dived by 60
in 10 mients

30

Just explain how to use X for him.