Subtract the numbers:  534  739  170 + 2,020  137 = ? Calculate the numbers difference and learn how to do the subtraction, column subtracting method, from right to left
The operation to perform:  534  739  170 + 2,020  137
Add the negative numbers together.
The operation to perform:  534  739  170  137
Add the numbers as if they were positive.
But at the end attach a minus sign in front of the result.
Method used below: column adding, from right to left (traditional).
Stack the numbers on top of each other.
The ones digits line up in the first column from the right.
The tens digits line up in the next column to the left.
And so on...
5
3
4
7
3
9
1
7
0
+
1
3
7
?
Add column by column; start from the column on the right.
Add the digits in the ones column:
4 + 9 + 0 + 7 = 20
How did we add the digits? Explanation below.
Group the ones together in order to make tens:
4 + 9 + 0 + 7 =
4 + 9 + 7 =
3 + 1 + 9 + 7 =
3 + 1 + 9 + 7 =
(3 + 7) + (1 + 9) =
10 + 10 =
20
Change the order in which the numbers are added, the sum stays the same. Break some number(s) into component parts, the sum stays the same.
The sum is a twodigit number: 20.
0 is the ones digit. Write it down at the base of the ones column.
2 is the tens digit. Carry it over to the tens column. Write the digit above that column. Add it with the rest of the digits in that column.
2
5
3
4
7
3
9
1
7
0
+
1
3
7
0
Add the digits in the tens column:
3 + 3 + 7 + 3 + 2 = 18
How did we add the digits? Explanation below.
Group the ones together in order to make tens:
3 + 3 + 7 + 3 + 2 =
3 + 3 + 7 + 3 + 2 =
(3 + 7) + 3 + 3 + 2 =
10 + 3 + 3 + 2 =
10 + 3 + 3 + 2 =
10 + 8 =
18
The sum is a twodigit number: 18.
8 is the tens digit. Write it down at the base of the tens column.
1 is the hundreds digit. Carry it over to the hundreds column. Write the digit above that column. Add it with the rest of the digits in that column.
1
2
5
3
4
7
3
9
1
7
0
+
1
3
7
8
0
Add the digits in the hundreds column:
5 + 7 + 1 + 1 + 1 = 15
How did we add the digits? Explanation below.
Group the ones together in order to make tens:
5 + 7 + 1 + 1 + 1 =
5 + 7 + 1 + 1 + 1 =
5 + 10 =
10 + 5 =
15
The sum is a twodigit number: 15.
5 is the hundreds digit. Write it down at the base of the hundreds column.
1 is the thousands digit. Write it down at the base, next to the hundreds digit.
1
2
5
3
4
7
3
9
1
7
0
+
1
3
7
1
5
8
0
Addition result:
534 + 739 + 170 + 137 = 1,580
Answer:  534  739  170  137 =  1,580
The initial operation has become:
 534  739  170 + 2,020  137 =
2,020  1,580
Now subtract the final numbers above: 2,020  1,580 = ?
Method used below: column subtracting, from right to left (traditional)
Stack the numbers on top of each other.
The ones digits line up in the first column from the right.
The tens digits line up in the next column to the left.
And so on...
2
0
2
0

1
5
8
0
?
Subtract column by column; start from the column on the right
Subtract the digits in the ones column:
0  0 = 0. 0 is the ones digit. Write it down at the base of the ones column.
2
0
2
0

1
5
8
0
0
Subtract the digits in the tens column:
2  8 = ?
The second digit is larger than the first. Borrow from the next column to the left.
In this case we borrow across zero(s), a multiple step process:
Subtract 1 from the top digit in the column directly to the left. But that digit is zero. You need to go further left.
Subtract 1 from the nearest column to the left with a nonzero top digit. That is the column of the thousands: 2  1 = 1. Cross out the top digit you've borrowed 1 from: 2. Write the answer above that digit: 1.
Cross out the zero(s) that you were going across to the left: 0. Write a 9 above each one of the crossed out zeros. Why? In fact we have subtracted 1 from 20: 20  1 = 19.
When borrowing, 1 hundred = 10 tens. Add 10 to the top digit in the column of the tens: 10 + 2 = ^{1}2.
1
9
2
0
^{1}2
0

1
5
8
0
0
After borrowing, the subtraction has become: 12  8 = 10 + 2  8 = 10 + 2  8 = 2 + (10  8) = 2 + 2 = 4. 4 is the tens digit. Write it down at the base of the tens column.
1
9
2
0
^{1}2
0

1
5
8
0
4
0
Subtract the digits in the hundreds column:
0 9  5 = 4. 4 is the hundreds digit. Write it down at the base of the hundreds column.
1
9
2
0
^{1}2
0

1
5
8
0
4
4
0
Subtract the digits in the thousands column:
2 1  1 = 0. 0 is the thousands digit. Write it down at the base of the thousands column.
1
9
2
0
^{1}2
0

1
5
8
0
0
4
4
0
Leading zeros
When leading zeros occupy the most significant digits of a natural number, they could be left blank and the numeric value stays the same: