What is the difference of 1,289 and 943?

1289 -

943

First last number should be subtracted.

9 - 3 = 6

The second last

8 - 4 = 4

Then first number

2-9 = ?

Since it can't be divided, we have to borrow 10 from the previous number.

12-9 = 3

So the answer is,

346