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The purpose of this Number Talk is to elicit the ways students look for to use the structure of two-digit numbers to subtract (MP7). These understandings help students develop fluency and will be helpful later in this lesson when students will need to be able to find the difference between the estimate and actual measurement of an object.
Encuentra mentalmente el valor de cada expresión.
Number Puzzles Addition and Subtraction Stage 4 Gameboards, Spanish
The purpose of this activity is for students to revisit Stage 4 of the Number Puzzles center which was first introduced in grade 1. Students work together to use digit cards to make addition and subtraction equations within 100 with composing and decomposing true. Each digit (0–9) can only be used once in a puzzle. Puzzles with less than ten spaces will have leftover cards.
None
The purpose of this activity is for students to choose from activities that focus on addition and subtraction within 100 or story problems. Students choose from previously introduced stages of these centers:
Escoge un centro.
Acertijos numéricos
Historias matemáticas