Mental Addition Strategies
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Mental Addition Strategies
🧠 Part 1: Partitioning Strategy
Strategy: Break numbers into tens and units, then add separately.
Example: 34 + 25 = (30 + 20) + (4 + 5) = 50 + 9 = 59
⚖️ Part 2: Compensation Strategy
Strategy: Round one number to make it easier, then adjust the answer.
Example: 47 + 29 = 47 + 30 - 1 = 77 - 1 = 76
38 + 20 - ____ = ____ - ____ = ____
🌉 Part 3: Bridging Strategy
Strategy: Add to the next ten first, then add the rest.
Example: 37 + 26 = 37 + 3 + 23 = 40 + 23 = 63
48 + ____ + ____ = ____ + ____ = ____
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