Bonjour
a. 234/342 = (18 x 13) / (18 x 19) = 13/19
b. 360/405 = (45 x 8) / (45 x 9) = 8/9
c. 612/1 044 = (36 x 17) / (36 x 29) = 17/29
d. 150/240 = (30 x 5) / (30 x 8) = 5/8
e. 87/123 = (3 x 29) / (3 x 41) = 29/41
f. 130/124 = (2 x 65) / (2 x 62) = 65/62
g. 95/115= (5 x 19) / (5 x 23) = 19/23
h. 378/459 = (27 x 14) / (27 x 17) = 14/17.