Here's an example number:
123.456
The place values are, from greatest to least:
The 1 is in the hundreds place
The 2 is in the tens place
The 3 is in the ones place
The 4 is in the tenths place
The 5 is in the hundredths place
If you have some number like 9.40 with no decimal point, shifting it will change the value. Moving the decimal one place to the right multiplies the value by ten. (94)
Moving it one place to the rigt divides it by ten. (0.94)
Here's our list from least to greatest:
94.0
9.40
0.94
0.094