71523951 divided by 901 
The aim is to understand the frequency of 901 in 71523951.

On to step 1:
7 divided by 901 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 901

Let's proceed to step 2:
The number 901 fits into 71 0 times, leaving a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 71 after subtracting 0 from 71.
Include the next digit (5) from the dividend after 71, then repeat: 715 / 901

Going ahead to step 3:
901 goes into 715 0 times with a remainder of 715.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 715, we end up with 715.
Fetch the next digit (2) from the dividend, attach it to 715 and continue: 7152 / 901

Step 4:
The number 901 fits into 7152 7 times, leaving a remainder of 845.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 6307 from 7152 to get 845.
Grab the next digit (3) from the dividend, add it to 845, then carry on: 8453 / 901

Step 5:
901 can be fit into 8453 9 times, resulting in a remainder of 344.
The next digit of our result is 9. 
Result so far: 79.0
If we take 8109 away from 8453, we end up with 344.
Fetch the next digit (9) from the dividend, attach it to 344 and continue: 3449 / 901

Going ahead to step 6:
The number 901 fits into 3449 3 times, leaving a remainder of 746.
The next digit of our result is 3. 
Result so far: 793.0
If we take 2703 away from 3449, we end up with 746.
Include the next digit (5) from the dividend after 746, then repeat: 7465 / 901

Let's proceed to step 7:
901 can be fit into 7465 8 times, resulting in a remainder of 257.
The next digit of our result is 8. 
Result so far: 7938.0
Deduct 7208 from 7465 and we're left with 257.
Bring next digit (1) of the dividend behind the 257 and repeat the process: 2571 / 901

Let's proceed to step 8:
When dividing 2571 by 901, we get 2 with a remainder of 769.
The next digit of our result is 2. 
Result so far: 79382.0
Subtract 1802 from 2571 to get 769.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7690, and continue the process.

Going ahead to step 9:
When dividing 7690 by 901, we get 8 with a remainder of 482.
Put 8 as the next digit of the answer. 
Result so far: 79382.8
If we take 7208 away from 7690, we end up with 482.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4820, and continue the process.

Step 10:
The number 901 fits into 4820 5 times, leaving a remainder of 315.
The next digit of our result is 5. 
Result so far: 79382.85
If we subtract 4505 from 4820, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Advancing to step 11:
The number 901 fits into 3150 3 times, leaving a remainder of 447.
Record the quotient 3 as the next digit in the result. 
Result so far: 79382.853
If we take 2703 away from 3150, we end up with 447.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4470, and continue the process.

On to step 12:
901 can be fit into 4470 4 times, resulting in a remainder of 866.
The number 4 becomes the next digit in our result. 
Result so far: 79382.8534
If we take 3604 away from 4470, we end up with 866.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8660, and continue the process.

Step 13:
901 goes into 8660 9 times with a remainder of 551.
Put 9 as the next digit of the answer. 
Result so far: 79382.85349
If we subtract 8109 from 8660, we get 551.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5510, and continue the process.

Let's proceed to step 14:
When dividing 5510 by 901, we get 6 with a remainder of 104.
Put 6 as the next digit of the answer. 
Result so far: 79382.853496
If we take 5406 away from 5510, we end up with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

On to step 15:
The number 901 fits into 1040 1 times, leaving a remainder of 139.
Use 1 as the next digit of our solution. 
Result so far: 79382.8534961
Subtract 901 from 1040 to 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.

Advancing to step 16:
901 goes into 1390 1 times with a remainder of 489.
The next digit of our result is 1. 
Result so far: 79382.85349611
If we take 901 away from 1390, we end up with 489.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

After the division, we end up with 79382.85349611 and a remainder of 4.89e-07.