Montana is about 74 times bigger than Delaware.

Delaware is approximately 5,060 sq km, while Montana is approximately 376,979 sq km, making Montana 7,350% larger than Delaware. Meanwhile, the population of Delaware is ~897,934 people (91,481 more people live in Montana).
Tip: This to-scale comparison of Delaware vs. Montana uses the Mercator projection, which distorts the size of regions near the poles.