81946860 ÷ 145 
The aim is to understand the frequency of 145 in 81946860.

Step 1:
The number 145 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 145

Step 2:
The number 145 fits into 81 0 times, leaving a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Fetch the next digit (9) from the dividend, attach it to 81 and continue: 819 / 145

Step 3:
819 divided by 145 is 5 with a remainder of 94.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 725 from 819, we get 94.
Bring next digit (4) of the dividend behind the 94 and repeat the process: 944 / 145

On to step 4:
944 divided by 145 is 6 with a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 56.0
Subtract 870 from 944 to get 74.
Append the next digit (6) from the dividend to 74 and continue with: 746 / 145

Let's proceed to step 5:
The number 145 fits into 746 5 times, leaving a remainder of 21.
The next digit of our result is 5. 
Result so far: 565.0
Subtracting 725 from 746 leaves us with 21.
Grab the next digit (8) from the dividend, add it to 21, then carry on: 218 / 145

Moving on to step 6:
218 divided by 145 is 1 with a remainder of 73.
The number 1 becomes the next digit in our result. 
Result so far: 5651.0
Subtract 145 from 218 to get 73.
Take the next digit (6) from the dividend and append it to 73, then repeat: 736 / 145

Advancing to step 7:
The number 145 fits into 736 5 times, leaving a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 56515.0
Deduct 725 from 736 and we're left with 11.
Take the next digit (0) from the dividend and append it to 11, then repeat: 110 / 145

Moving on to step 8:
145 goes into 110 0 times with a remainder of 110.
Put 0 as the next digit of the answer. 
Result so far: 565150.0
If we take 0 away from 110, we end up 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.

Going ahead to step 9:
The number 145 fits into 1100 7 times, leaving a remainder of 85.
Use 7 as the next digit of our solution. 
Result so far: 565150.7
If we subtract 1015 from 1100, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

On to step 10:
145 goes into 850 5 times with a remainder of 125.
Put 5 as the next digit of the answer. 
Result so far: 565150.75
Deduct 725 from 850 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Moving on to step 11:
The number 145 fits into 1250 8 times, leaving a remainder of 90.
Write down 8 as next digit of the result. 
Result so far: 565150.758
If we subtract 1160 from 1250, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 12:
If we divide 900 by 145, we get 6 and a remainder of 30.
Record the quotient 6 as the next digit in the result. 
Result so far: 565150.7586
If we take 870 away from 900, we end up 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.

Advancing to step 13:
When dividing 300 by 145, we get 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 565150.75862
If we subtract 290 from 300, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 14:
When dividing 100 by 145, we get 0 with a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 565150.75862
Deduct 0 from 100 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 15:
If we divide 1000 by 145, we get 6 and a remainder of 130.
The number 6 becomes the next digit in our result. 
Result so far: 565150.7586206
Subtract 870 from 1000 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 16:
145 goes into 1300 8 times with a remainder of 140.
Use 8 as the next digit of our solution. 
Result so far: 565150.75862068
Subtract 1160 from 1300 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The quotient of the division is 565150.75862068, and the remainder is 1.4e-07.