Q:

# how to break apart addends as tens and ones

18  __+ ___
+21  __+ ___
______________
___ + ____ = ___
In Topics:
> 60 days ago

|

writes:
i dont know thats why i am here
> 60 days ago

Did you find this answer useful?
0
yes
4
no
writes:
I teach this strategy in my second grade classroom.  I have the students break the numbers into what is called expanded form like this.

18 + 21  would be rewritten as 10 +8 and 20 + 1   Then the students would add up the tens numbers of 10 + 20=30  Then they would add the ones numbers of 8+1=9  And then they could add 30 +9=39

Although this may seem cumbersome to you it is a helpful strategy for student because they can see all the numbers easily. It shows the place value of the numbers in a way that the traditional way doesn't.  It is also a great strategy for advanced students that can start doing these in their heads.

I tell my students and parents that I want to teach many different methods of solving problems so students have an arsenal to use when solving problems.  I also teach the traditional borrow and carry method that most parents are familiar with (it is called regrouping now.)
> 60 days ago

Did you find this answer useful?
11
yes
0
no
writes:
1+8 2+1 =39
> 60 days ago

Did you find this answer useful?
1
yes
1
no
writes:
18 - 10 + 8
+21 - 20 + 1

30 + 9 = 39
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
10 +8
10+11
18+21
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
10+8
20+1
30+9=39
> 60 days ago

Did you find this answer useful?
1
yes
1
no
writes:
10+8
20+1
30+9=39
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
10 + 8
+20 + 1
30 + 9 =39
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
18+21=39
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
18  __+ ___
+21
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
9+9
12+9
21+18
18+21=39
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
1+8=9
1+2=3
18+21=39
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
need help with break apart the addends

18 plus 21
> 60 days ago

Did you find this answer useful?
2
yes
0
no
writes:
10 + 8

20 + 1

30 + 9

39
> 60 days ago

Did you find this answer useful?
2
yes
0
no
writes:
I am teaching the same strategy to my kids, this helps them to find sums easily and faster. I am agree when you say that it is good to teach them an aresenal of methods and they choose the one that is easier for each one.
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
10+8
20+1
18+21
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
20 + 20=40
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
10+8
20+1
--------
30+9=39
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
How to break a parts addends ?
> 60 days ago

Did you find this answer useful?
1
yes
0
no
writes:
I just want a example because i'm confuse.
> 60 days ago

Did you find this answer useful?
1
yes
0
no
• 1