Contributor: Erika Wargo. Lesson ID: 12216
Subtracting large numbers might seem difficult, but not if you "borrow" the usual subtraction rules and "regroup" to make it simple! Practice with interactive quizzes and the chance to teach others!
Disneyland and Hollywood are calling! A trip to California costs $2,504. Your family has $1,162 saved so far. How much more money do they need to save?
Subtracting large numbers can seem impossible, but is it really that different from other subtraction problems?
Share with your parent or teacher what you know about subtracting numbers.
Did you remember these important rules?
For example, 15  8 = 7, so if we check, 7 + 8 = 15.
Before going on, review regrouping with Go Next Door (Subtraction with Regrouping song) by EDROCKER:
After the video, discuss with a parent or teacher:
To subtract whole numbers:
$2,504  $1,162 =
Rewrite the problem, with the greater number on top:
$ 
2 
5 
0 
4 

 
$ 
1 
1 
6 
2 

$ 
Subtract and regroup as needed, starting in the ones place:
4 
_{1} 

$ 
2 
5 
0 
4 

 
$ 
1 
1 
6 
2 

$ 
1 
3 
4 
2 
"Add up" and check your work. $2,504 is the number we started with, so we are correct!
1 

$ 
1 
3 
4 
2 

+ 
$ 
1 
1 
6 
2 

$ 
2 
5 
0 
4 
Discuss with a parent or teacher how to check a subtraction problem. How are addition and subtraction related?
In the Got It? section, you will practice fourdigit subtraction with games!
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