

 Activity   
Students learn the value of numbers. 

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 Activity   
A machine to calculate all kinds of sums. 

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 Lesson plan   
Use fraction models to add and subtract fractions with unlike denominators, and progressing to solve addition and subtraction problems without modeling. 

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 Activity   
Learn how to translate English phrases into algebraic expressions. 

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 Activity   
Students learn how written phrases are interpreted as numeric expressions. 

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 Lesson plan   
Develop fluency with addition and subtraction of nonnegative rational numbers with unlike denominators. 

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 Activity   
Learning how to add and subtract. 

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 Lesson plan   
Add and subtract decimals to solve problems. Solve problems involving money. 

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 Activity   
Apply the properties of operations to generate equivalent expressions by completing the missing information. 

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 Activity   
Students learn how to partition numbers. 

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 Activity   
Students learn the value of numbers. Ones up to a billion. 

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 Activity   
A clear and simple bead necklace. 

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 Lesson plan   
Add and subtract decimals, with instruction and practice targeted at correctly organizing numbers to avoid typical computational errors. 

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 Lesson plan   
Practice twin numbers up to 20. 

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 Activity   
Teach students the meaning of adding and subtracting. 

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