100 + 100 : 10 * 20 +70 = .................................
100 * 100 + 200 = .......................................
1111+1111+1111+1111+1111+1111+1111+1111+1111+1111 = ....................................................................
1111 * 10 = ................................................................
1111+1111=?
1111+2222=
1111+66846=?
1111+2222=
11111.....+1111....
1111+199999
1111+20000=?
1111+2222+3333=...?