Answer:
Look in Pic
Explanation:
First you are going to look at what your number is
you have -0.9 and -1.2
now as you see theres a number in your wholes place, look for that number
once you find it count what ever your decimal is once you find where you counted mark it on the line same for numbers with 0 just look for either 1 and count back
Example:
you have 1.5 and 2.1
you have a number line with 1, 2 and 3 with 4 spaces in between each number for the 1.5 find the whole number on the line then count 5 over, for 2.15 find the whole number on the line then count 1 over!