PlayThinker

Instructions

1. Type numbers into Operand A and Operand B.
2. Pick an operation—add, subtract, multiply, or divide.
3. Press Start to watch the columns solve the problem one step at a time.
4. Pause if you want to explain a carry or borrow, then resume to keep going.
5. Hit Reset to try new numbers or a different operation.

Learning Notes

Seeing the work unfold shows why the algorithms make sense.

• Digits stay lined up so place value never gets lost.
• Carries, borrows, and partial products glow when they matter.
• Division shows repeated subtraction or partial quotients, which connects to equal groups.

Before each press of the button, predict the next step. Were you right?