Something smells fishy with this interactive task card activity on adding numbers within 20. This resource contains interactive task cards that focus on adding numbers within 20. It features colourful mini cards with different addition equations and big underwater-themed cards that contain the sum of the numbers. The goal of this activity is for the students to add the numbers in order to identify their sum. Then, they will be tasked to sort the mini cards and place them on their correct big cards.