We divide 78021 by 61
The aim is to understand the frequency of 61 in 78021.

Let's proceed to step 1:
If we divide 7 by 61, 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.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 61

Going ahead to step 2:
The number 61 fits into 78 1 times, leaving a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 61 from 78, we get 17.
Bring next digit (0) of the dividend behind the 17 and repeat the process: 170 / 61

Going ahead to step 3:
170 divided by 61 is 2 with a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we subtract 122 from 170, we get 48.
Fetch the next digit (2) from the dividend, attach it to 48 and continue: 482 / 61

On to step 4:
482 divided by 61 is 7 with a remainder of 55.
Put 7 as the next digit of the answer. 
Result so far: 127.0
If we subtract 427 from 482, we get 55.
Fetch the next digit (1) from the dividend, attach it to 55 and continue: 551 / 61

On to step 5:
551 divided by 61 is 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 1279.0
Subtracting 549 from 551 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 6:
61 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 1279.0
Subtract 0 from 20 to get 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 7:
61 goes into 200 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 1279.03
If we take 183 away from 200, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 8:
170 divided by 61 is 2 with a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 1279.032
Subtract 122 from 170 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 9:
The number 61 fits into 480 7 times, leaving a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 1279.0327
Deduct 427 from 480 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 10:
If we divide 530 by 61, we get 8 and a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 1279.03278
If we take 488 away from 530, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 11:
61 goes into 420 6 times with a remainder of 54.
Put 6 as the next digit of the answer. 
Result so far: 1279.032786
Deduct 366 from 420 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 12:
61 can be fit into 540 8 times, resulting in a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 1279.0327868
If we take 488 away from 540, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 13:
When dividing 520 by 61, we get 8 with a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 1279.03278688
Subtract 488 from 520 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

After the division, we end up with 1279.03278688 and a remainder of 3.2e-08.