Result: 420 millimeters is about 16 17/32 of an inch.
The answer is 16 17/32 inches. The result is sometimes only an approximation of the real value because of rounding. But it's accurate enough for typical everyday measurements.
To convert 420 millimeters to an inch fraction, you need to first convert 420 millimeters to inches. Since 1 inch is equal to 25.4 millimeters, divide 420 by 25.4 to get decimal inches:
420 mm ÷ 25.4 = 16.5354 in
Then, let's convert the decimal value of 16.5354 inches to a fraction.
To convert 16.5354 inches to a fraction, use a ruler or a decimal to fraction conversion table to find the nearest fraction with a reasonable denominator (fractional inches usually have denominators that are powers of 2, such as 2, 4, 8, 16, 32, 64).
In this example, use a ruler to find the closest fraction.
Using a ruler, you can see that 16.5354 inches is very close to 16 17/32 inches.
Therefore, 420 millimeters is approximately equal to 16 17/32 inches.