please help me, also please don't put A decimal answer because my teacher told me that's incorrect. you can add or subtract depending on the question, or check if you need to simplify!

Answer
Difference between the heaviest and lightest kitten = ¼ pound
Explanation
We can see from the number line in the question that the spaces from 0 to 1 are eight in number. This means that each space has a value of (1/8)
So for the kitten that weighed the least, it's at the third small line from 0, indicating that
Weight of the smallest kitten = (3/8) pound
And for the heaviest kitten, it is at the fifth small line in between 0 and 1.
Weight of the heaviest kitten = (5/8) pound
Difference between the weight of the heaviest and lightes kitten
Difference = (5/8) - (3/8) = (2/8) = (1/4) pounds
Hope this Helps!!!