Concept:Descending order means arranging numbers from the largest to the smallest.
Explanation:First, write all numbers with the same number of decimal places for easy comparison:
30.5=30.500,
3.50=3.500,
3.055=3.055,
3.05=3.050,
3.005=3.005,
0.355=0.355.
Now compare the whole parts and then the decimal digits:
30.500 is the largest because the whole part is 30.
Next,
3.500 (which is 3.50) is larger than
3.055,
3.050, and
3.005 because the tenths digit 5 > 0.
Among
3.055,
3.050,
3.005, compare hundredths:
3.055>3.050>3.005 because 5 > 5? Actually 3.055 has hundredths 5, 3.050 has hundredths 5 as well? Wait: 3.055 vs 3.050: thousandths 5 > 0 so 3.055 > 3.050. Then 3.050 > 3.005 because hundredths 5 > 0. Finally,
0.355 is the smallest.
Thus, descending order is:
30.5,
3.50,
3.055,
3.05,
3.005,
0.355.
Answer:Option A: 30.5, 3.50, 3.055, 3.05, 3.005, 0.355