42951 ÷ 2 = 21475 R1
No problem, we've got 42951 and 2 for the division.

Step 1:
2 goes into 4 2 times with a remainder of 0.
Write down 2 as next digit of of the result. 
Result so far: 2
Subtract 4 from 4 to get 0.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 2

Step 2:
2 goes into 2 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 21
Subtract 2 from 2 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 2

Step 3:
2 goes into 9 4 times with a remainder of 1.
Write down 4 as next digit of of the result. 
Result so far: 214
Subtract 8 from 9 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 2

Step 4:
2 goes into 15 7 times with a remainder of 1.
Write down 7 as next digit of of the result. 
Result so far: 2147
Subtract 14 from 15 to get 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 2

Step 5:
2 goes into 11 5 times with a remainder of 1.
Write down 5 as next digit of of the result. 
Result so far: 21475
Subtract 10 from 11 to get 1.

The final result is 21475 with a remainder of 1.