We look at the division of 670990 by 42 
We want to figure out the number of times 670990 can be divided by 42.

Going ahead to step 1:
When dividing 6 by 42, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 42

Step 2:
When dividing 67 by 42, we get 1 with a remainder of 25.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 42 from 67 to get 25.
Grab the next digit (0) from the dividend, add it to 25, then carry on: 250 / 42

Moving on to step 3:
When dividing 250 by 42, we get 5 with a remainder of 40.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we take 210 away from 250, we end up with 40.
Append the next digit (9) from the dividend to 40 and continue with: 409 / 42

Moving on to step 4:
409 divided by 42 is 9 with a remainder of 31.
The next digit of our result is 9. 
Result so far: 159.0
If we take 378 away from 409, we end up with 31.
Append the next digit (9) from the dividend to 31 and continue with: 319 / 42

Going ahead to step 5:
42 goes into 319 7 times with a remainder of 25.
The next digit of our result is 7. 
Result so far: 1597.0
The remainder is 25 after subtracting 294 from 319.
Fetch the next digit (0) from the dividend, attach it to 25 and continue: 250 / 42

Going ahead to step 6:
42 can be fit into 250 5 times, resulting in a remainder of 40.
The number 5 becomes the next digit in our result. 
Result so far: 15975.0
Deduct 210 from 250 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 7:
42 goes into 400 9 times with a remainder of 22.
The next digit of our result is 9. 
Result so far: 15975.9
Subtracting 378 from 400 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 8:
42 goes into 220 5 times with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 15975.95
Subtracting 210 from 220 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
42 can be fit into 100 2 times, resulting in a remainder of 16.
Write down 2 as next digit of the result. 
Result so far: 15975.952
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 10:
42 goes into 160 3 times with a remainder of 34.
The next digit of our result is 3. 
Result so far: 15975.9523
If we subtract 126 from 160, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 11:
The number 42 fits into 340 8 times, leaving a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 15975.95238
If we take 336 away from 340, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 12:
When dividing 40 by 42, we get 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 15975.95238
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 13:
If we divide 400 by 42, we get 9 and a remainder of 22.
The next digit of our result is 9. 
Result so far: 15975.9523809
If we take 378 away from 400, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 14:
220 divided by 42 is 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 15975.95238095
The remainder is 10 after subtracting 210 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 15975.95238095 with a remainder of 1e-08.