42021350 ÷ 124 
We're looking to find how many times 124 goes into 42021350.

Step 1:
124 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 124

Going ahead to step 2:
42 divided by 124 is 0 with a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Grab the next digit (0) from the dividend, add it to 42, then carry on: 420 / 124

Moving on to step 3:
The number 124 fits into 420 3 times, leaving a remainder of 48.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 48 after subtracting 372 from 420.
Append the next digit (2) from the dividend to 48 and continue with: 482 / 124

On to step 4:
124 can be fit into 482 3 times, resulting in a remainder of 110.
Use 3 as the next digit of our solution. 
Result so far: 33.0
The remainder is 110 after subtracting 372 from 482.
Append the next digit (1) from the dividend to 110 and continue with: 1101 / 124

Moving on to step 5:
The number 124 fits into 1101 8 times, leaving a remainder of 109.
The next digit of our result is 8. 
Result so far: 338.0
Subtracting 992 from 1101 leaves us with 109.
Take the next digit (3) from the dividend and append it to 109, then repeat: 1093 / 124

Going ahead to step 6:
The number 124 fits into 1093 8 times, leaving a remainder of 101.
The number 8 becomes the next digit in our result. 
Result so far: 3388.0
If we take 992 away from 1093, we end up with 101.
Take the next digit (5) from the dividend and append it to 101, then repeat: 1015 / 124

Let's proceed to step 7:
When dividing 1015 by 124, we get 8 with a remainder of 23.
Record the quotient 8 as the next digit in the result. 
Result so far: 33888.0
Deduct 992 from 1015 and we're left with 23.
Include the next digit (0) from the dividend after 23, then repeat: 230 / 124

Step 8:
230 divided by 124 is 1 with a remainder of 106.
Use 1 as the next digit of our solution. 
Result so far: 338881.0
If we take 124 away from 230, we end up with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Going ahead to step 9:
When dividing 1060 by 124, we get 8 with a remainder of 68.
The next digit of our result is 8. 
Result so far: 338881.8
If we subtract 992 from 1060, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 10:
If we divide 680 by 124, we get 5 and a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 338881.85
If we take 620 away from 680, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 11:
124 goes into 600 4 times with a remainder of 104.
Put 4 as the next digit of the answer. 
Result so far: 338881.854
Subtracting 496 from 600 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

On to step 12:
124 goes into 1040 8 times with a remainder of 48.
Record the quotient 8 as the next digit in the result. 
Result so far: 338881.8548
Subtracting 992 from 1040 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 13:
124 goes into 480 3 times with a remainder of 108.
Use 3 as the next digit of our solution. 
Result so far: 338881.85483
If we subtract 372 from 480, we get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 14:
When dividing 1080 by 124, we get 8 with a remainder of 88.
The next digit of our result is 8. 
Result so far: 338881.854838
If we subtract 992 from 1080, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Step 15:
124 can be fit into 880 7 times, resulting in a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 338881.8548387
Deduct 868 from 880 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 16:
When dividing 120 by 124, we get 0 with a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 338881.8548387
Subtract 0 from 120 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

The final outcome is 338881.8548387, with a leftover of 1.2e-07.