It is 2.25 inches - whether on a ruler or on a measuring tape or whatever.
4.2 inches is about 10.5 cm
On a 12 inch ruler, the 1/3 point would be 12/3, or at 4 inches.
Whether on a ruler or anywhere else, it is still 1.35 inches. No ruler is graduated with at that level of detail. A tenth of an inch is typical. So you want a point halfway between 1.3 inches and 1.4 inches. Alternatively, you can draw a line of 1.35*2 = 2.7 inches (the ruler will measure that) and then bisect it.
12/16 is 3/4 13/16 will be a hair to the right of 3/4
one and 1/4
It is about just over 4 inches
4 inches are 10.16 centimeters.
one and 1/4
It is 2.25 inches - whether on a ruler or on a measuring tape or whatever.
You will not find 4.78 inches on a ruler. The graduations for inches are numbered and these are usually subdivided into 10. So 4.78 inches will be a tine fraction short of the eighth division after the 4 inch mark.
10cm is about 4 inches.
Between 3 and 4 on the inches side. Inches may be divided into 10ths or 16ths but you will certainly not have a ruler that gives thousandths of an inch.
bY looking at a ruler, you can tell that therre are about 9.9 cm in 4 inches
4.2 inches is about 10.5 cm
100 millimeters is equivalent to 10 centimeters or approximately 3.94 inches on a standard ruler.
On a 12 inch ruler, the 1/3 point would be 12/3, or at 4 inches.