If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

The best answer is: 

In order to solve this problem, rewrite the problem vertically, making sure to align or line up the decimal point. Remember to annex zeroes where necessary. In this problem you would annex one zero after the 2, thus making the decimal 34.20, and because 9 is a whole number it is represented as 9.00 as a decimal.

Adding from right to left we get the following. Recall that when a column adds to ten or greater we need to carry the tens digit to the next column.

To find the sum, we will add the two numbers together.  So, we line the numbers up by the place values starting from the right.  Then, we add from right to left. So, we start with

Now, we add the right most numbers.  We get

We add the next numbers.  We get

We add the next numbers.  We get

We write the comma.  We get

Now, we add the last numbers.  We get

Therefore, the final answer is 10,866.

If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

To add these two numbers, first add the values in the one's places, 

.  

Then add the numbers in the ten's places, 

.  

Then put the two values together to get .

First you add the ones places together 

.  

Then you add the  to that to get 

.