Online Calculator Resource

+
= ?

carry
1
1
2

9
3
7

1
2
9
+
2
2
4
8

3
3
1
4

Ones Place Value
7 + 9 + 8 = 24
Put the 4 in Ones place
Carry the 2 to Tens place
carry

2

9
3
7

1
2
9
+
2
2
4
8

4

Tens Place Value
2 + 3 + 2 + 4 = 11
Put the 1 in Tens place
Carry the 1 to Hundreds place
carry

1
2

9
3
7

1
2
9
+
2
2
4
8

1
4

Hundreds Place Value
1 + 9 + 1 + 2 = 13
Put the 3 in Hundreds place
Carry the 1 to Thousands place
carry
1
1
2

9
3
7

1
2
9
+
2
2
4
8

3
1
4

Thousands Place Value
1 + 2 = 3
Put the 3 in Thousands place
carry
1
1
2

9
3
7

1
2
9
+
2
2
4
8

3
3
1
4

## Calculator Use

Add whole numbers and decimal numbers using long addition showing work. This calculator will show the complete solution by long addition.

Separate values by commas or new lines. For example, when adding 123 + 456 + 7890 use either of the following formats:

Separated by commas
Separated by new lines
Whole
Numbers
123,456,7890
123
456
7890
Decimal
Numbers
0.987,65.4,32.1
0.987
65.4
32.1

Do not use a thousands comma separator. For example, enter 10,000 as 10000 without a comma. Also, use only positive numbers.

Long addition is a process for adding numbers together. Numbers are stacked and aligned by place value columns. Numbers are then added column by column with a single digit from each row starting with the One's place value, then the Ten's place value, etc. If the total value of any one column is more than one digit, the additional digits are "carried" to the next highest column.

Stack and align the numbers by place value columns

Ones Place Value
7 + 9 + 8 = 24
Put the 4 in Ones place
Carry the 2 to Tens place

carry

2

9
3
7

1
2
9
+

2
4
8

4

Tens Place Value
2 + 3 + 2 + 4 = 11
Put the 1 in Tens place
Carry the 1 to Hundreds place

carry

1
2

9
3
7

1
2
9
+

2
4
8

1
4

Hundreds Place Value
1 + 9 + 1 + 2 = 13
Put the 3 in Hundreds place
Carry the 1 to Thousands place

carry
1
1
2

9
3
7

1
2
9
+

2
4
8

3
1
4

Thousands Place Value
1 = 1
Put the 1 in Thousands place

carry
1
1
2

9
3
7

1
2
9
+

2
4
8

1
3
1
4

The process for long addition with decimals is the same as the process of long addition of whole numbers with the added column for decimal places. Just like place values are stacked in the same column, all decimal points are stacked in the same column. If your individual numbers have different numbers of decimal places then pad the right with zeros untill they all have the same number of decimal places.

For example, add 37.5 + 129.44 + 48.123

carry
1
2
1

3
7
.
5
0
0

1
2
9
.
4
4
0
+

4
8
.
1
2
3

2
1
5
.
0
6
3

## Related Calculators

See the Long Subtraction with Regrouping Calculator to do long subtraction with regrouping or borrowing and see the work.

Cite this content, page or calculator as:

Furey, Edward "Long Addition Calculator"; from http://www.calculatorsoup.com - Online Calculator Resource.