Erin collects stamps. At the beginning of the year 2021, she had 276 stamps in her collection. By the end of the year, she had added 113 new stamps. By the end of the next year, she had gotten another 244 new stamps. How many stamps did Erin have in her collection at the end of 2022 ?

To find out how many stamps Erin had at the end of 2022, we can start with her initial count and add the stamps she collected over the two years. She began with 276 stamps and added 113 stamps in 2021 and then 244 stamps in 2022. So, the calculations would be: 276 (initial stamps) + 113 (2021 additions) + 244 (2022 additions) = 633 stamps. At the end of 2022, Erin had a total of 633 stamps in her collection!