Bonjour
a. 5/4 + 4/5 = (5 x 5) / (4 x 5) + (4 x 4) / (5 x 4) = 25/20 + 16/36 = 41/20
b. 2 + 3/4 = (2 x 4) / (1 x 4) + 3/4 = 8/4 + 3/4 = 11/4
c. 4/3 - 1/6 = (4 x 2) / (3 x 2) - 1/6 = 8/6 - 1/6 = 7/6
d. 1/10 - 9/100 = (1 x 10) / (10 x 10) - 9/100 = 10/100 - 9/100 = 1/100
e. 6/5 x 30/7 = 180/35 = (5 x 36) / (5 x 7) = 36/7
f. 5/4 x 8/15 = 40/60 = (20 x 2) / (20 x 3) = 2/3.
