Addition
Large-number addition
Add two, three, or four values with five, six, or seven digits while maintaining alignment across long columns.
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Multi-digit addition
Add two to five addends with one-, two-, three-, or four-digit values in aligned vertical columns.
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Align ones with ones, add from right to left, record each regroup above the next column, and estimate to check the sum.
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What this activity builds
Add several multi-digit whole numbers while aligning equal place values and recording every regroup.
Worked example
What is 2,408 + 1,375 + 1,216?
4,999
The ones make 19: write 9 and carry 1 ten. The tens then make 9, the hundreds make 9, and the thousands make 4.
Teaching notes
Make the practice count
- Use graph paper when place-value alignment is still developing.
- Have learners estimate by rounding before finding the exact sum.
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Related activities
Addition
Mixed-digit multi-addend addition
Add two, three, four, or five values with independently selected one- through four-digit widths in vertical form.
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