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# Add 3 Digits & Estimate to Check

Common Core Standards
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In this activity students use task cards to solve 3 digit addition problems. Students then round addends to tens or hundreds and add to find an estimated sum. Students compare their actual sum with estimated sum to check for reasonableness.

Task cards can be used in a small group, as center work, or as a search & find activity around the classroom.

CCSS 3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations and/or the relationship between addition and subtraction.

Essential Question: How can place value help me add larger numbers

Objective: Students will add three digit numbers and use estimation to check for reasonableness.
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