a)
4/7 = 4 ÷ 7 = 0,57142857142
5/18 = 5 ÷ 18 = 0,2777...
4/7 > 5/18
b)
25/76 = 25 ÷ 76 = 0,32894736842
12/37 = 12 ÷ 37 = 0,32432432432
25/76 > 12/37
c)
357/450 = 357 ÷ 450 = 0,79333...
276/350 = 276 ÷ 350 = 0,78857142857
357/450 > 276/350
