42689288 ÷ 646 
We want to divide 42689288 by 646.

Step 1:
646 can be fit into 4 0 times, resulting in a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 646

Advancing to step 2:
The number 646 fits into 42 0 times, leaving a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Take the next digit (6) from the dividend and append it to 42, then repeat: 426 / 646

Step 3:
If we divide 426 by 646, we get 0 and a remainder of 426.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 426, we end up with 426.
Grab the next digit (8) from the dividend, add it to 426, then carry on: 4268 / 646

Moving on to step 4:
646 goes into 4268 6 times with a remainder of 392.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 3876 from 4268, we get 392.
Fetch the next digit (9) from the dividend, attach it to 392 and continue: 3929 / 646

Let's proceed to step 5:
3929 divided by 646 is 6 with a remainder of 53.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
The remainder is 53 after subtracting 3876 from 3929.
Fetch the next digit (2) from the dividend, attach it to 53 and continue: 532 / 646

Advancing to step 6:
The number 646 fits into 532 0 times, leaving a remainder of 532.
Record the quotient 0 as the next digit in the result. 
Result so far: 660.0
The remainder is 532 after subtracting 0 from 532.
Fetch the next digit (8) from the dividend, attach it to 532 and continue: 5328 / 646

Moving on to step 7:
The number 646 fits into 5328 8 times, leaving a remainder of 160.
Write down 8 as next digit of the result. 
Result so far: 6608.0
The remainder is 160 after subtracting 5168 from 5328.
Append the next digit (8) from the dividend to 160 and continue with: 1608 / 646

On to step 8:
The number 646 fits into 1608 2 times, leaving a remainder of 316.
Put 2 as the next digit of the answer. 
Result so far: 66082.0
If we subtract 1292 from 1608, we get 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Step 9:
646 can be fit into 3160 4 times, resulting in a remainder of 576.
Use 4 as the next digit of our solution. 
Result so far: 66082.4
If we subtract 2584 from 3160, we get 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

On to step 10:
If we divide 5760 by 646, we get 8 and a remainder of 592.
Put 8 as the next digit of the answer. 
Result so far: 66082.48
The remainder is 592 after subtracting 5168 from 5760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Let's proceed to step 11:
If we divide 5920 by 646, we get 9 and a remainder of 106.
The number 9 becomes the next digit in our result. 
Result so far: 66082.489
Subtract 5814 from 5920 to get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Let's proceed to step 12:
If we divide 1060 by 646, we get 1 and a remainder of 414.
The number 1 becomes the next digit in our result. 
Result so far: 66082.4891
If we subtract 646 from 1060, we get 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

On to step 13:
4140 divided by 646 is 6 with a remainder of 264.
Write down 6 as next digit of the result. 
Result so far: 66082.48916
If we subtract 3876 from 4140, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Going ahead to step 14:
646 goes into 2640 4 times with a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 66082.489164
Subtracting 2584 from 2640 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 15:
The number 646 fits into 560 0 times, leaving a remainder of 560.
Put 0 as the next digit of the answer. 
Result so far: 66082.489164
If we take 0 away from 560, we end up with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Advancing to step 16:
The number 646 fits into 5600 8 times, leaving a remainder of 432.
Write down 8 as next digit of the result. 
Result so far: 66082.48916408
Deduct 5168 from 5600 and we're left with 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

The final outcome is 66082.48916408, with a leftover of 4.32e-07.