Which is correct, in each number, or on each number or for each number? I need to ask questions mentioning that each number has a different instruction.
Any help that includes sentence examples will be so appreciated. Thanks in advance.
Context is king, all of your phrases can be grammatically correct:
In each number from twelve to ninety-nine, the letter "t" appears at least once.
When playing hopscotch, you start the game by jumping on each number in numerical order.
For each number which contains a 3 or is divisible by 3, say "Fizz" instead of the number.
It sounds like this is what you're getting at:
For each number, there will be a different set of instructions.
But Jake is right, to get the best help, please write some example sentences to show us your needs.