3/11+(-7/9) = -50/99
99 + 3 = 102
505
99... without using a calculator !
Sum of numbers from 1 to 100:(1+100) + (2+99) + (3+98) + (4+97) + ... + (49+52) + (50+51) =50 pairs, each pair adds up to 101= (50 x 101)= 5,050
105
1+3=4 4+5=9 9+.97=9.97 9.97+99=108.97
It is: 2+3+(3*15) = 50
108
50 + 3 + 3 = 56
1, 2, 5, 10, 25, 50 1, 3, 9, 11, 33, 99
10 plus 20-2 - 11 plus 3 is equal to 20.