Question

how do you know 8 thousandths is less than 1 hundredths

Answer 1

Hundredths have two digit after the decimal point   0.01
Thousandths have 3 digits after the decimal point 0.008

Answer 2

Thousandths are smaller than hundredths.

0.001
      ^Thousandths place

0.01
     ^Hundredths place