Drag to Align
Place values must line up! Drag the blue digits to the correct boxes.
{{ digit }}
{{ zone.current !== null ? zone.current : (zone.active ? '' : '0') }}
{{ item.val }}
Tap to Solve
Add from right to left. Don't forget to carry!
{{ col.userCarry !== null ? col.userCarry : '' }}
{{ col.d1 !== null ? col.d1 : '' }}
{{ col.d2 !== null ? col.d2 : '' }}
{{ col.userSum !== null ? col.userSum : '' }}
Tap to Borrow
Top number too small? Tap a left neighbor to borrow, then tap bottom boxes to answer.
{{ val }}
{{ col.bottom }}
{{ col.ans !== null ? col.ans : '0' }}
Build the Answer
Use the arrows to dial in the final correct answer.
{{ col.n1 !== null ? col.n1 : '' }}
{{ col.n2 !== null ? col.n2 : '' }}
{{ col.ans }}
🏆
Math Master!
You've mastered multi-digit addition and subtraction!