Addition
Multi-digit addition
Add two to five addends with one-, two-, three-, or four-digit values in aligned vertical columns.
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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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Align every addend at the ones place, add each column from right to left, and record all carries before moving on.
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What this activity builds
Align mixed-width addends and manage several column totals without losing an addend or place.
Worked example
What is 2,306 + 418 + 75 + 9?
2,808
Right-align the four addends, then add the ones, tens, hundreds, and thousands columns with their carries.
Teaching notes
Make the practice count
- Draw vertical guides when the addends have different lengths.
- Count the addends in every column so none is skipped.
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A useful next step
Related activities
Addition
Large mixed-digit addition
Add two, three, or four mixed-width values with five-, six-, or seven-digit selections and multiple regrouping steps.
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