We're dividing 42900391 by 620 
We want to figure out the number of times 42900391 can be divided by 620.

Advancing to step 1:
620 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 620

Step 2:
620 can be fit into 42 0 times, resulting in a remainder of 42.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Grab the next digit (9) from the dividend, add it to 42, then carry on: 429 / 620

Let's proceed to step 3:
620 can be fit into 429 0 times, resulting in a remainder of 429.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 429, we get 429.
Append the next digit (0) from the dividend to 429 and continue with: 4290 / 620

Moving on to step 4:
620 goes into 4290 6 times with a remainder of 570.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 3720 away from 4290, we end up with 570.
Grab the next digit (0) from the dividend, add it to 570, then carry on: 5700 / 620

Step 5:
When dividing 5700 by 620, we get 9 with a remainder of 120.
Record the quotient 9 as the next digit in the result. 
Result so far: 69.0
Subtract 5580 from 5700 to get 120.
Grab the next digit (3) from the dividend, add it to 120, then carry on: 1203 / 620

Moving on to step 6:
If we divide 1203 by 620, we get 1 and a remainder of 583.
Record the quotient 1 as the next digit in the result. 
Result so far: 691.0
Deduct 620 from 1203 and we're left with 583.
Append the next digit (9) from the dividend to 583 and continue with: 5839 / 620

Step 7:
620 goes into 5839 9 times with a remainder of 259.
The number 9 becomes the next digit in our result. 
Result so far: 6919.0
Deduct 5580 from 5839 and we're left with 259.
Fetch the next digit (1) from the dividend, attach it to 259 and continue: 2591 / 620

Moving on to step 8:
2591 divided by 620 is 4 with a remainder of 111.
Use 4 as the next digit of our solution. 
Result so far: 69194.0
The remainder is 111 after subtracting 2480 from 2591.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Moving on to step 9:
1110 divided by 620 is 1 with a remainder of 490.
Put 1 as the next digit of the answer. 
Result so far: 69194.1
Deduct 620 from 1110 and we're left with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Moving on to step 10:
When dividing 4900 by 620, we get 7 with a remainder of 560.
The number 7 becomes the next digit in our result. 
Result so far: 69194.17
Subtract 4340 from 4900 to get 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

On to step 11:
620 can be fit into 5600 9 times, resulting in a remainder of 20.
The number 9 becomes the next digit in our result. 
Result so far: 69194.179
If we take 5580 away from 5600, we end up with 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 12:
If we divide 200 by 620, we get 0 and a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 69194.179
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 13:
When dividing 2000 by 620, we get 3 with a remainder of 140.
Record the quotient 3 as the next digit in the result. 
Result so far: 69194.17903
The remainder is 140 after subtracting 1860 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 14:
If we divide 1400 by 620, we get 2 and a remainder of 160.
Put 2 as the next digit of the answer. 
Result so far: 69194.179032
The remainder is 160 after subtracting 1240 from 1400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Step 15:
620 can be fit into 1600 2 times, resulting in a remainder of 360.
Write down 2 as next digit of the result. 
Result so far: 69194.1790322
If we take 1240 away from 1600, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

The final outcome is 69194.1790322, with a leftover of 3.6e-06.