Yes.
No, 04 = 4 whereas 040 = 40. You usually do not put a zero before a non-zero number unless you are using a decimal point. If you meant to use a decimal point, then .04 and .040 are equal although the latter is considered to be more precise because it is accurate to 2 decimal places wheras the former is accurate to only one decimal place.
To convert from inches to mm, you must multiply by 25.4.
They are decimals that have equal value.
two decimals equal to 0.8 = 0.80, 0.800
two decimals that are equal to 3.7 = 3.70, 3.700
two decimals are equal to 0.9 = 0.90, 0.900
there are no such things as equal decimals (at least that is what i think correct me if i am wrong)
7 040 yards = 4miles
0.0103092784
23.0
.5
decima which is equal to 7.5 = 7.50