Please post your question ** here ** rather than a link to it (the link does not work) .
Without multiplying? Does that include doing estimate in your head?
Here's what the question asks for: 3 x 1/5 x 17/8
What I did: I said 17/8 is a little more than 2. Call it 2+ note that it is less than 2.5
2+/5 is a little less than 1/2 Call it 1/2–
A little less than half of 3 is a little less than 1&1/2 That's where R is on the line.
Is that okay?