Part Adder make your own hard sums

                                                                  Part Adder,2 digit numbers & tens/ones
I stared 48 and 49 and then i took away 8 from the 48 wich is 40  and then I took away 9 from the 49 wich is 80 then I adder 9+8=17 and then I adder 17 and 80 wich=97.

                                                                     Part Adder,2 digit numbers & tens/ones

 Part Adder,2 digit numbers & tens/one

I started with 48 and 49 then I took away 20 from both numbers wich=40 then I added 28 and 29 to the 40 wich = 97