## Adding Two And Three Digit Numbers

Here are the steps to adding two digit numbers:

Example: 25 + 34 = 59

• Always begin by adding the numbers in the ones column first: 5 + 4 = 9.
• Next add the numbers in the tens column: 2 + 3 = 5. Remember that the 2, 3 and 5 in the tens column actually stand for 20 + 30 = 50.
• The final answer or sum is 59.

Place Value

Tens

Ones

## 9

The next example is trickier.

Example: 59 + 37 = 96

• Add the numbers in the ones column: 9 + 7 = 16. Notice that only the 6 is written in the ones column. This is because the 1 belongs in the tens column as it is in the tens place in the number 16. The one is "carried over" to the tens column.
• Add the numbers in the tens column: 1 + 5 + 3 = 9. Remember those numbers actually represent 10, 50, 30 and 90.
• The final answer or sum is 96.
Example: Adding Two Digit Numbers with Carrying

Place Value

Tens

Ones

Carried number

## 6

The same process takes place with bigger numbers - follow the steps:

Example: 589 + 373 = 962

• First add the numbers in the ones column: 9 + 3 = (1)2. Notice there is a 1 that must be carried to the tens column. This represents the number 10.
• Next add the numbers in the tens column: 1 + 8 + 7 = (1)6. This represents the numbers 10 + 80 + 70 = 150 Now there is a 1 that must be carried to the hundreds column. This represents the number 100.
• Finally add the numbers in the hundreds column: 1 + 5 + 3 = 9. This represents the numbers 100 + 500 + 300 = 900
• The final answer or sum is 962..

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Place Value

Hundreds

Tens

Ones

Carried number

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## 2

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Addition - Subtraction - Multiplication - Division - Place Value - Rounding

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