A missing addend is the unknown part in an addition situation or equation, such as ; the learner determines it by relating the known part to the total, often counting on or finding the difference, with sums within 20. Part–whole diagrams, ten-frames, and number lines can represent this relationship and establish addition and subtraction as inverse operations, without extending to larger numbers or symbolic generalizations.
A missing addend is the number that makes the total.
Example:
So, is the missing addend.
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