Build Each Sum One Digit at a Time.
Practice vertical addition with two-digit, three-digit, and four-digit numbers. Drag the correct digits into the answer boxes and complete each addition problem in column form.
Grades 2–4
3 grade levels
10 rounds
Drag & drop
Instant feedback
Play again & again!
Every new game creates a fresh set of addition problems, answer tiles, and regrouping patterns for extra practice.
Choose a grade level
Grade labels are a guide. Choose the number size that matches the learner’s current skills.