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To order them from least to greatest, we can convert them each into decimals.
To convert a fraction into a decimal, simply divide the numerator by the denominator.
1)

To convert

into a decimal, simply divide the numerator which is 3, by the denominator which is 5.
3 ÷ 5 = 0.6
So,

is equal to 0.6 as a decimal.
2)

To convert

into a decimal, simply divide the numerator which is 3, by the denominator which is 7.
3 ÷ 7 = 0.43 approximately
So,

is equal to 0.43 as a decimal. (approximately)
3)

To convert

into a decimal, simply divide the numerator which is 3, by the denominator which is 4.
3 ÷ 4 = 0.75
So,

is equal to 0.75 as a decimal.

⇒ 0.6

⇒ 0.43

⇒ 0.75
So, from least to greatest, the order is:

,

,

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