Addition practice

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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Read each signed number carefully. Add from left to right, using mental math or a vertical rewrite when useful.

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Learning objective

What this activity builds

Interpret horizontal addition and choose an efficient mental or written strategy for two addends.

Worked example

What is 38 + (−15)?

Adding negative 15 has the same effect as moving 15 left from 38: 38 − 15 = 23.

Teaching notes

Make the practice count

Ask for an estimate before exact calculation.
Use parentheses around negative addends so the operation and sign are visually distinct.
Include zero when learners are ready to practice the additive identity across either digit-width setting.

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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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