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# Addition & Subtraction Equations Lessons

## Interactive Adding – Matching Pairs for 20, 50, & 100 (1st Grade)

Dream Box – Matching Number Pairs for Twenty.  Students practice computation strategies and identify number patterns and relationships to make twenty in a variety of ways. Lesson Dream Box – Matching Number Pairs for Fifty.  Students practice computation strategies and identify number patterns and relationships to make fifty in a variety of ways.  Lesson Dream Box – Matching…

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Dream Box – Matching Number Pairs for Two Hundred.  Students practice computation strategies and identify number patterns and relationships to make two hundred in a variety of ways.  Lesson Dream Box – Addition with Tens on the Number Line.  Using an open number line, students jump by tens to decompose addition problems into friendly steps.  Lesson  …

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## Interactive Number Equivalency (2nd & 3rd Grade)

Second Grade Dream Box – Build Expressions Equal to Twenty. Using expressions that have one to three addends, this tool engages students in understanding various number pairs that equal up to twenty.  Lesson Dream Box – Build Expressions Equal to One Hundred.  Using expressions that have one to three addends, this tool engages students in understanding equivalence of…

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Dream Box – Addition on the Number Line Using Landmark Numbers.  Using an open number line, students leverage landmark numbers such as tens and hundreds to solve addition problems.  Lesson Dream Box – Subtraction on the Number Line Using Constant Difference.  Using an open number line, students explore a compensation strategy as a vehicle to create…

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## Interactive Subtraction Algorithm (4th Grade)

Dream Box – Subtraction Algorithm.  Students use the standard subtraction algorithm and a place value workspace to solve subtraction problems involving up to two 3-digit numbers.  Lesson CCSS.MATH.CONTENT.4.NBT.B.4 Fluently add and subtract multi-digit whole numbers using the standard algorithm.

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## Mental Math Strategies

These printable mental math strategies or similar ones should be embedded throughout the math year and are excellent to promote during Number Talks. Addition and Subtraction Strategies Multiplication and Division Strategies

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## Number Talks – 4th Grade

Fourth Grade Number Talks. Number Talk Multi-Digit Addition Single and Double Digit Multiplication Number Talk Multi-Digit Addition

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## Number Talks – Third Grade

Third Grade Number Talks. Number Talk – Subtraction Strategies Number Talk – Multiplication Number Talk – Multiplication as Repeated Addition Number Talk – Multiplication Solving 7 x 6 and 7 x 7 Number Talk – Subtraction

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## Number Talk Videos – Second Grade

Second Grade Number Talk Examples Number Talk: 49 + 29 Number Talk: 16 + 15 Number Talks: Using Compensation

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## Printable Benchmark Fractions, Decimals, and Percents.

Fraction, Decimal, Percent Bars  – Free Printable Fraction, Decimal, Percent Bars. Great for comparing or converting. You can put the up on the Elmo or the Smart Board. Smart Board Fraction Strips – You can use the electronic worksheets on the Smart Board, or you can use these colored fractions for a better look.…

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