3/5 is simply 3 times 1/5.
Knowing 1/5 of something is very helpful to deduce 3/5 of that thing as it will save from doing divisions which are almost always harder than doing multiplication.
When you're given with [tex]\dfrac{x}{y}[/tex], it can be rewritten as [tex]x \times \dfrac{1}{y}[/tex]
Thus, [tex]\dfrac{3}{5}[/tex] can be rewritten as [tex]3 \times \dfrac{1}{5}[/tex] which tells that 3/5 is 3 times 1/5
Thus,
[tex]\dfrac{1}{5} \times 10 = 2\\\\\: \rm Thus,\\\\\dfrac{3}{5} \times 10 = 3 \times \dfrac{1}{5} \times 10 = 3 \times 2 = 6[/tex]
Hence, knowing 1/5 of something is very helpful to deduce 3/5 of that thing as it will save from doing divisions which are almost always harder than doing multiplication.
Learn more about fractions here:
https://brainly.com/question/17724027
