13071220 divided by 161 
We want to figure out the number of times 13071220 can be divided by 161.

Step 1:
1 divided by 161 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 161

Advancing to step 2:
13 divided by 161 is 0 with a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 161

Step 3:
The number 161 fits into 130 0 times, leaving a remainder of 130.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 130, we get 130.
Take the next digit (7) from the dividend and append it to 130, then repeat: 1307 / 161

On to step 4:
161 goes into 1307 8 times with a remainder of 19.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtracting 1288 from 1307 leaves us with 19.
Grab the next digit (1) from the dividend, add it to 19, then carry on: 191 / 161

Let's proceed to step 5:
161 goes into 191 1 times with a remainder of 30.
The next digit of our result is 1. 
Result so far: 81.0
Deduct 161 from 191 and we're left with 30.
Bring next digit (2) of the dividend behind the 30 and repeat the process: 302 / 161

Step 6:
The number 161 fits into 302 1 times, leaving a remainder of 141.
Use 1 as the next digit of our solution. 
Result so far: 811.0
Subtracting 161 from 302 leaves us with 141.
Bring next digit (2) of the dividend behind the 141 and repeat the process: 1412 / 161

On to step 7:
When dividing 1412 by 161, we get 8 with a remainder of 124.
The number 8 becomes the next digit in our result. 
Result so far: 8118.0
Subtract 1288 from 1412 to get 124.
Bring next digit (0) of the dividend behind the 124 and repeat the process: 1240 / 161

On to step 8:
When dividing 1240 by 161, we get 7 with a remainder of 113.
The number 7 becomes the next digit in our result. 
Result so far: 81187.0
If we subtract 1127 from 1240, we get 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Going ahead to step 9:
If we divide 1130 by 161, we get 7 and a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 81187.7
If we take 1127 away from 1130, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 10:
161 can be fit into 30 0 times, resulting in a remainder of 30.
The next digit of our result is 0. 
Result so far: 81187.7
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 11:
161 goes into 300 1 times with a remainder of 139.
The next digit of our result is 1. 
Result so far: 81187.701
If we subtract 161 from 300, we get 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

On to step 12:
The number 161 fits into 1390 8 times, leaving a remainder of 102.
Record the quotient 8 as the next digit in the result. 
Result so far: 81187.7018
The remainder is 102 after subtracting 1288 from 1390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Going ahead to step 13:
If we divide 1020 by 161, we get 6 and a remainder of 54.
Write down 6 as next digit of the result. 
Result so far: 81187.70186
If we subtract 966 from 1020, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 14:
161 can be fit into 540 3 times, resulting in a remainder of 57.
Write down 3 as next digit of the result. 
Result so far: 81187.701863
The remainder is 57 after subtracting 483 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 15:
161 goes into 570 3 times with a remainder of 87.
The next digit of our result is 3. 
Result so far: 81187.7018633
Subtracting 483 from 570 leaves us with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

The final outcome is 81187.7018633, with a leftover of 8.7e-07.