98609150 ÷ 645 
The aim is to understand the frequency of 645 in 98609150.

Step 1:
9 divided by 645 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (8) from the dividend, attach it to 9 and continue: 98 / 645

Going ahead to step 2:
The number 645 fits into 98 0 times, leaving a remainder of 98.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 98 to get 98.
Append the next digit (6) from the dividend to 98 and continue with: 986 / 645

Step 3:
645 goes into 986 1 times with a remainder of 341.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 645 from 986 to get 341.
Take the next digit (0) from the dividend and append it to 341, then repeat: 3410 / 645

Moving on to step 4:
3410 divided by 645 is 5 with a remainder of 185.
Write down 5 as next digit of the result. 
Result so far: 15.0
Deduct 3225 from 3410 and we're left with 185.
Append the next digit (9) from the dividend to 185 and continue with: 1859 / 645

On to step 5:
645 goes into 1859 2 times with a remainder of 569.
Use 2 as the next digit of our solution. 
Result so far: 152.0
Subtract 1290 from 1859 to get 569.
Fetch the next digit (1) from the dividend, attach it to 569 and continue: 5691 / 645

Let's proceed to step 6:
645 goes into 5691 8 times with a remainder of 531.
Record the quotient 8 as the next digit in the result. 
Result so far: 1528.0
If we subtract 5160 from 5691, we get 531.
Bring next digit (5) of the dividend behind the 531 and repeat the process: 5315 / 645

Step 7:
5315 divided by 645 is 8 with a remainder of 155.
Put 8 as the next digit of the answer. 
Result so far: 15288.0
If we take 5160 away from 5315, we end up with 155.
Fetch the next digit (0) from the dividend, attach it to 155 and continue: 1550 / 645

Moving on to step 8:
If we divide 1550 by 645, we get 2 and a remainder of 260.
Put 2 as the next digit of the answer. 
Result so far: 152882.0
Deduct 1290 from 1550 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 9:
When dividing 2600 by 645, we get 4 with a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 152882.4
Subtract 2580 from 2600 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.

Let's proceed to step 10:
If we divide 200 by 645, we get 0 and a remainder of 200.
Write down 0 as next digit of the result. 
Result so far: 152882.4
Subtract 0 from 200 to get 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 11:
If we divide 2000 by 645, we get 3 and a remainder of 65.
Write down 3 as next digit of the result. 
Result so far: 152882.403
If we take 1935 away from 2000, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 12:
645 goes into 650 1 times with a remainder of 5.
The next digit of our result is 1. 
Result so far: 152882.4031
If we subtract 645 from 650, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 13:
The number 645 fits into 50 0 times, leaving a remainder of 50.
The next digit of our result is 0. 
Result so far: 152882.4031
If we take 0 away from 50, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 14:
645 goes into 500 0 times with a remainder of 500.
Record the quotient 0 as the next digit in the result. 
Result so far: 152882.4031
If we take 0 away from 500, we end up with 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

The quotient of the division is 152882.4031, and the remainder is 5e-05.