ENDLESS PRACTICE for all elementary addition, subtraction, multiplication, division and rounding! These 29,000 TASK CARDS practice all elementary computational skills using both word problems and simple fluency practice. They are broken into the following 29 sets with 1,000 task cards apiece:Word problems:âś” Adding within 10âś” Adding within 20âś” Adding within 100âś” Adding within 100 per 1.NBT.4âś” Adding within 1,000 (2.NBT.7 and 3.NBT.2)âś” Adding within 10,000âś” Subtracting up to 10âś” Subtracting up to