In this math activity students can roll dice to make 3 or 4 digit addends. Students add the addends to find the "actual sum." Students then round the addends to find an estimated sum and ask themselves if their "actual sum" was a reasonable answer.
Dice are not required for this activity - students can think of their own 3 or 4 digit numbers or draw numbers from cards, etc.
This activity/center was designed for CCSS 3.NBT.2
This math activity helps students answer the essential question "How can place value help me add larger numbers?"