Question

please give step by step explanation​

Answer 1

Answer:

how to check ur addition

1+99=100

simple substract ur answer from any of the number and if u get other one means ur answer is correct

like 100-1=99 or

100-99=1

similarly units place

9-3=A

A=6

7-1=A=6

Answer 2

Answer is attached please mark as brainliest and give thnx