1 cm = 10 mm
30 cm = (30 x 10) = 300 mm
484 is a greater number than 300, so 484 mm is longer than 300 mm, and is therefore
more than 30 cm also, too, as well.
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One foot is equal to 30.48 centimetres.
A year is 12 months, so 3 years would be 36 months...longer than your 30 months.
30 inches equals 2 1/2 feet, which is longer than 2 feet.
12 inches x 2 feet = 24 inches. Therefore, 2 feet is shorter than 30 inches by 6 inches.
30 mph, as a mile is longer than a kilometer.