Let's divide 64548974 by 646
We want to figure out the number of times 64548974 can be divided by 646.

Step 1:
646 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 646

On to step 2:
If we divide 64 by 646, we get 0 and a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Grab the next digit (5) from the dividend, add it to 64, then carry on: 645 / 646

Step 3:
645 divided by 646 is 0 with a remainder of 645.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 645, we end up with 645.
Take the next digit (4) from the dividend and append it to 645, then repeat: 6454 / 646

Step 4:
6454 divided by 646 is 9 with a remainder of 640.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Deduct 5814 from 6454 and we're left with 640.
Take the next digit (8) from the dividend and append it to 640, then repeat: 6408 / 646

On to step 5:
When dividing 6408 by 646, we get 9 with a remainder of 594.
Use 9 as the next digit of our solution. 
Result so far: 99.0
The remainder is 594 after subtracting 5814 from 6408.
Grab the next digit (9) from the dividend, add it to 594, then carry on: 5949 / 646

Step 6:
If we divide 5949 by 646, we get 9 and a remainder of 135.
Use 9 as the next digit of our solution. 
Result so far: 999.0
If we subtract 5814 from 5949, we get 135.
Fetch the next digit (7) from the dividend, attach it to 135 and continue: 1357 / 646

Step 7:
646 goes into 1357 2 times with a remainder of 65.
The number 2 becomes the next digit in our result. 
Result so far: 9992.0
If we subtract 1292 from 1357, we get 65.
Take the next digit (4) from the dividend and append it to 65, then repeat: 654 / 646

Moving on to step 8:
When dividing 654 by 646, we get 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 99921.0
The remainder is 8 after subtracting 646 from 654.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
If we divide 80 by 646, we get 0 and a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 99921.0
If we take 0 away from 80, we end up 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.

On to step 10:
646 can be fit into 800 1 times, resulting in a remainder of 154.
Write down 1 as next digit of the result. 
Result so far: 99921.01
Subtract 646 from 800 to get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

On to step 11:
1540 divided by 646 is 2 with a remainder of 248.
Record the quotient 2 as the next digit in the result. 
Result so far: 99921.012
If we take 1292 away from 1540, we end up with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Advancing to step 12:
646 goes into 2480 3 times with a remainder of 542.
Record the quotient 3 as the next digit in the result. 
Result so far: 99921.0123
The remainder is 542 after subtracting 1938 from 2480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

Going ahead to step 13:
The number 646 fits into 5420 8 times, leaving a remainder of 252.
The next digit of our result is 8. 
Result so far: 99921.01238
Subtracting 5168 from 5420 leaves us with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

On to step 14:
646 can be fit into 2520 3 times, resulting in a remainder of 582.
The number 3 becomes the next digit in our result. 
Result so far: 99921.012383
Deduct 1938 from 2520 and we're left with 582.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

Let's proceed to step 15:
If we divide 5820 by 646, we get 9 and a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 99921.0123839
Subtract 5814 from 5820 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 16:
The number 646 fits into 60 0 times, leaving a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 99921.0123839
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 99921.0123839 with a remainder of 6e-08.