ENDLESS PRACTICE for addition! These 15,000 TASK CARDS practice addition from 0 all the way up to four-digit sums using both word problems and simple fluency practice. They are broken into the following 15 sets with 1,000 task cards apiece: Fluency practice:Adding within 10 Task CardsAdding within 20 Task CardsAdding within 100 Task CardsAdding within 100 Task Cards (1.NBT.4)Adding within 1000 Task Cards (2.NBT.7, 3.NBT.2)Adding within 10,000 Task CardsAdding 10 to 2-Digit Numbers, 1.NBT.5 Add