Addition practice

Four-addend horizontal addition

Add four selected one- or two-digit signed values, pairing compatible addends to reduce mental load.

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Preserve every sign, choose helpful pairs, find each partial sum, and combine the partial sums.

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Learning objective

What this activity builds

Use the associative and commutative properties to combine four signed addends accurately.

Worked example

What is 24 + (−9) + 6 + 9?

The −9 and +9 cancel to 0, so the remaining sum is 24 + 6 = 30.

Teaching notes

Make the practice count

Look first for opposites or pairs that make a multiple of ten.
Require one line of partial sums so a skipped addend is easy to find.

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A useful next step

Related activities

Addition

Three-addend horizontal addition

Combine three selected one- or two-digit signed values in a horizontal equation and use grouping to simplify the work.

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