71264087 divided by 780 
The aim is to understand the frequency of 780 in 71264087.

Step 1:
If we divide 7 by 780, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 780

Let's proceed to step 2:
When dividing 71 by 780, we get 0 with a remainder of 71.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 71, we end up with 71.
Bring next digit (2) of the dividend behind the 71 and repeat the process: 712 / 780

Let's proceed to step 3:
The number 780 fits into 712 0 times, leaving a remainder of 712.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 712 to get 712.
Append the next digit (6) from the dividend to 712 and continue with: 7126 / 780

Going ahead to step 4:
780 can be fit into 7126 9 times, resulting in a remainder of 106.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtract 7020 from 7126 to get 106.
Grab the next digit (4) from the dividend, add it to 106, then carry on: 1064 / 780

Step 5:
780 goes into 1064 1 times with a remainder of 284.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
The remainder is 284 after subtracting 780 from 1064.
Take the next digit (0) from the dividend and append it to 284, then repeat: 2840 / 780

Step 6:
If we divide 2840 by 780, we get 3 and a remainder of 500.
Write down 3 as next digit of the result. 
Result so far: 913.0
Subtract 2340 from 2840 to get 500.
Take the next digit (8) from the dividend and append it to 500, then repeat: 5008 / 780

Step 7:
When dividing 5008 by 780, we get 6 with a remainder of 328.
Put 6 as the next digit of the answer. 
Result so far: 9136.0
Subtracting 4680 from 5008 leaves us with 328.
Fetch the next digit (7) from the dividend, attach it to 328 and continue: 3287 / 780

Moving on to step 8:
780 can be fit into 3287 4 times, resulting in a remainder of 167.
Write down 4 as next digit of the result. 
Result so far: 91364.0
Subtracting 3120 from 3287 leaves us with 167.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1670, and continue the process.

Step 9:
If we divide 1670 by 780, we get 2 and a remainder of 110.
Put 2 as the next digit of the answer. 
Result so far: 91364.2
Deduct 1560 from 1670 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Step 10:
If we divide 1100 by 780, we get 1 and a remainder of 320.
The next digit of our result is 1. 
Result so far: 91364.21
If we subtract 780 from 1100, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Going ahead to step 11:
When dividing 3200 by 780, we get 4 with a remainder of 80.
Record the quotient 4 as the next digit in the result. 
Result so far: 91364.214
Subtracting 3120 from 3200 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 12:
780 can be fit into 800 1 times, resulting in a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 91364.2141
Deduct 780 from 800 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 13:
780 goes into 200 0 times with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 91364.2141
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 14:
2000 divided by 780 is 2 with a remainder of 440.
Write down 2 as next digit of the result. 
Result so far: 91364.214102
If we take 1560 away from 2000, we end up with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Going ahead to step 15:
780 goes into 4400 5 times with a remainder of 500.
The next digit of our result is 5. 
Result so far: 91364.2141025
The remainder is 500 after subtracting 3900 from 4400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Advancing to step 16:
780 can be fit into 5000 6 times, resulting in a remainder of 320.
The number 6 becomes the next digit in our result. 
Result so far: 91364.21410256
If we take 4680 away from 5000, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

The final outcome is 91364.21410256, with a leftover of 3.2e-07.