Question

1,345,456,234,234,345,234,-1234,567,890=? My subsititue is being mean so we can not use calculatars and I do not like to cheat anyway but in this case (yes)

Answer 1

1,345,456,232,999, 777,344

Explanation:

1,345,456,23 4, 2 3 4, 3 4 5, 2 3 4,

-1 2 3 4, 5 6 7, 8 9 0

1,345,456,23 2, 9 9 9, 7 7 7, 3 4 4

So we write the ones under the ones, tens under the tens starting from the right hand side.

The first numbers can be easily subtracted as 4 is greater than zero. Then comes 3 which is less than 9 so we borrow 1 digit from the left to right to make it 13 and subtract 9 from it and get a 4. Then we are left with 1 as we have already borrowed 1 digit. As 1 is less than 8 we again borrow 1 digit from the left to make it 11 and subtract 8 and get 3. So the next number is 4 as we have already borrowed 1 and it is less than 7 . Again we will borrow 1 digit from the left to make it 14 and subtract 7 to get a 7.

So the process continues until we get the answer.