a) 43/10 + 5/10 = 48/10 = 2x24/2x5 = 24/5
b) 6/12 + 2/24 = 6x2/12x2 + 2/24 = 12/24 + 2/24 = 14/24 = 2x7/2x12 = 7/12
c) 6/5 + 2/15 = 6x3/5x3 + 2/15 = 18/15 + 2/15 = 20/15 = 5x4/ 5x3 = 4/3
d) 1/30+ 2/3 = 1/30 + 2x10/3x10 = 1/30 + 20/30 = 21/30 = 3x7/3x10 = 7/10