I have 3 questions:-
1. How to convert a decimal into a fraction?
2. How to convert a fraction into a decimal?
3. How can we represent 1.67 on a number line?
For the first two questions, your are requested to go through the next lesson:
Lesson 3: Inter-Conversion Of Decimals And Fractions
To represent 1.67 on a number line, divide the gap between 1 and 2 into 100 equal parts.
Then, the 67th part from the number marked as 1 represents 1.67.
Hope this helps.