These fall-themed cards are great for practicing subtraction! They are also a good tool to use for practicing estimating differences. It is easy to differentiate using these cards--there are 12 cards each of 3 digit, 4 digit, and 5 digit numbers, for a total of 36 problems. They can be used in stations, as a scoot game, for enrichment in younger grades, or a review in older grades. These problems do require regrouping.