Emma uses a 250 yard roll of crepe paper to make streamers How many dekameters of crepe paper does Emma use.?

To convert yards to dekameters, first convert yards to meters (1 yard is approximately 0.9144 meters). Therefore, 250 yards is about 228.6 meters. Since 1 dekameter equals 10 meters, Emma uses approximately 22.86 dekameters of crepe paper.