What a great way to practice number sense this Halloween! Students add and subtract 10 and 50 for 2-digit numbers, and 10 and 100 for 3-digit numbers. 3 leveled sheets are perfect for differentiation during math groups and math centers, or you can use the sheets whole group at different points this Fall/Halloween as the students progress in their skills. I plan to use these as seatwork during math centers or morning work. Also could be great homework! Also check out my Fall, springtime and summer number sense packs!