State how much larger or smaller the first unit is than the second.
square decimeter, square kilometer
The first unit, square decimeter, is smaller than the second unit, square kilometer.
To determine how much larger or smaller the first unit (square decimeter) is than the second unit (square kilometer), we need to compare their sizes.
1 square kilometer is equivalent to 1,000,000 square meters.
1 square meter is equivalent to 10,000 square decimeters.
Therefore, 1 square kilometer is equal to 1,000,000 x 10,000 = 10,000,000,000 square decimeters.
Since 1 square kilometer is much larger than 10,000,000,000 square decimeters, we can conclude that the first unit (square decimeter) is smaller than the second unit (square kilometer) by a factor of 10,000,000,000.