Answer:
If we only use tenths, then we wont be able to model the hundredths place value that is the value of 4 in the given decimal.
Step-by-step explanation:
We are given the number 6.84
The place value chart for this number can be written as:
Place value: Ones . Tenths Hundredths
6.84: 6 . 8 4
The decimal expansion can be written as:

If we only use tenths, then we wont be able to model the hundredths place value that is the value of 4 in the given decimal.
To model 4 that is 0.04, we need

To model 6, we need
