What kinds of behavior can lead you to believe that a child does not have a solid understanding of the base-ten system?

struggling behavior in answering base-ten system

Explanation:

When a child is given a question on such question, and he/she struggles with it, he keeps asking questions relating to the question, shows that he is doesn't not understand that topic.

Most children exhibit different kind of attitude when asked a question relating to a topic or aspect they have been taught. when a child doesn't feel excited to answer the question, show he does not like the question or he is struggling with the question. So that struggling behavior explains that he does not have a firm understanding to such question as the base-ten system

1 and 2

explanation:

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.