Addition
Horizontal two-addend addition
Add two one- or two-digit values in equation form using selected positive, negative, or mixed signed addends, with an optional zero-operand setting.
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Large horizontal addition
Add signed three- or four-digit values in horizontal form using place-value, compensation, or a vertical rewrite.
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Keep each sign with its number. Estimate, add or compensate, and rewrite vertically when that makes place values clearer.
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What this activity builds
Interpret signed large-number addition and select an accurate mental or written strategy.
Worked example
What is 3,450 + (−1,275)?
2,175
Adding negative 1,275 is equivalent to 3,450 − 1,275, which gives 2,175.
Teaching notes
Make the practice count
- Use parentheses around negative addends.
- Ask learners to explain why the sign and approximate size of the answer are reasonable.
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Related activities
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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