Build addition fluency all year long with this 100 Days of Addition Facts worksheet set perfect for daily practice, math warm-ups, morning work, homework, and math centers. Each worksheet contains 15 vertical addition problems using numbers 0–9.What’s Included 100 unique single-digit addition worksheets Numbers 0–9 only 15 problems per page Answer keys included Black-and-white, printer-friendly format Consistent layout for easy student use Skills Covered Single-digit addition facts Adding wit