ratio: 72 to 126
can be turned into a fraction 72/126
we then simplify the fraction 72/126
72 ÷ 2 = 36
126 ÷ 2 = 63
36 ÷ 3 = 12
63 ÷ 3 = 21
72/126 ⇒ 36/63 ⇒ 12/21
ratio of 72 to 126 is 12 to 21.
72/126 = 0.5714
12/21 = 0.5714

Maizie

72/126
divide both by: 1, 2, 3, 6, 9, or 18
i went with: 6
72 divided by 6 = 12 times 6 = 72
126 divided by 6 = 21 times 6 = 126
now the fraction is: 12/21