Case II- with borrow (donation is required)
Example 1 –
5725 –
1857
3868
5-1=4 3 (check right as 7<8 we will write 3 instead of 4 as we are donating 1)
7 – 8 =8 (here 7 will become 17-8=9 8 check right as 2<5 donation is required)
2 – 5 =7 6( 12- 5=7 but right side needs donation)
5 – 7 =8 (15-7)
Final answer will be 3868
Example 2 –
7643 –
1371
6272
7 – 1 =6
6 – 3 = 3 2 (donation to right)
4 – 7 = 7 (14 – 7 )
3 – 1 = 2
Final answer will be 6272
Example 3 -
347 –
182
165
3 – 1 =2 1
4 – 8 = 6 (14 – 8 = 6)
7 – 2 =5
Final answer is 165