Step-by-step explanation:
In expanded form, we can describe a number ABC as follows.
[tex]ABC = A \times 10^2 + B \times 10^1 + C \times 10^0[/tex]
Therefore, 78 can be described in expanded form as follows.
78 = [tex]7 \times 10 + 8[/tex]
= 78
Also, we can describe 78 in words as seventy eight.