If the number is below ten, then you would use words to represent the numbers, when they are above ten, you use the number (:
Arabic numerals (the common 1,2,3,4, etc.) were decided upon independently by everyone because they are so much easier to manipulate.
Digital electronics devices handle numbers in the form of the binary system. That is, the numbers are represented in base-2, with only two digits. That way, when a digit comes along, it's much easier for the electronic device to decide what digit it is.
The farthest number from zero is the greatest number.
An actuary is a person, employed by an insurance company, to assess the risk, and decide on the rate of premium.
u decide
stylebook
Will you ever decide what to do?
I am trying to decide, right now.
I can't decide whether or not to go to bed.
Arabic numerals (the common 1,2,3,4, etc.) were decided upon independently by everyone because they are so much easier to manipulate.
be
I decide to stop my colloboration with this person
I couldn't decide what to wear to school. The teacher said he would decide later on the student's punishment.
He couldn't decide what he wanted to eat. Did you decide which movie you want to watch?
i shall decide wether or not to go to the shrine later.
In the sentence, It's up to you to decide, It's is used as a contraction for It is. It's used correctly here.
this is a sentence I decide I will broach the subject on the way down in the train.