Final answer:
Adding Amy's 80 coins to Annie's 75 coins, we get a total of 155 coins for both of them combined.
Step-by-step explanation:
If Amy sorts 80 coins and Annie sorts 75 coins, and both have less than 2000 coins, we can calculate the total number of coins they have together by simply adding the number of coins each has sorted. To do this, we use the operation of addition:
Amy's coins: 80
Annie's coins: 75
To find the total, we calculate:
80 (Amy's coins) + 75 (Annie's coins) = 155 coins
Therefore, together, Amy and Annie have 155 coins.