Mrs. Goris bought 13 packs of goodie bags at the store for a huge Halloween party. There were 21 bags in each pack. How many goodie bags did she buy? Which answer choice shows the correct re-grouping calculations and answer?
200 + 60 + 10 + 3 = 263 bags
20 + 60 + 10 + 3 = 93 bags
200 + 60 + 10 + 3 = 273 bags
200 + 60 + 100 + 3 = 363 bags