identify the numerical order of these fractions from smallest to largest:1 3/6, 2 3/5, 7/9, 1 7/8

To determine the numerical order of these fractions from smallest to largest, we can convert each mixed number to an improper fraction and then compare them.

1 3/6 = (1*6 + 3)/6 = 9/6
2 3/5 = (2*5 + 3)/5 = 13/5
7/9 remains as is.
1 7/8 = (1*8 + 7)/8 = 15/8

So, the fractions in numerical order from smallest to largest are:
9/6, 13/5, 7/9, 15/8.