Well, darling, 1.2 inches on a ruler is simply 1 inch plus 2 tenths of an inch. It's not rocket science, honey. Just count 1 inch and then move over 2 more lines for those extra tenths. Easy peasy lemon squeezy.
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On a 12 inch ruler, the 1/3 point would be 12/3, or at 4 inches.
1 ruler (12 inches) is 30.48cm
1 yard = 36 inches = 3 times the 12 inch ruler.
It is 12/0.78
the 9th mark on a ruler in inches is 9/16 inches for centimeters its 9/10 cm.