

 Lesson plan   
Solve addition and subtraction problems, including word problems involving twoandthree digit numbers. Complete in addition and subtraction sentence with missing addends including inverse relationships between and addition and subtraction. 

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 Activity   
Look at the items. Add one (or subtract one) and write down that number. 

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 Activity   
Students learn how to partition numbers. 

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 Activity   
Formatting numbers for decimals. Students will learn to understand the place value of every number. 

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 Lesson plan   
Develop and analyze strategies for adding and subtracting numbers. 

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 Lesson plan   
Estimate sums and differences. 

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 Activity   
Teach students the meaning of adding and subtracting. 

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

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 Lesson plan   
Practice twin numbers up to 20. 

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 Lesson plan   
Students will estimate to judge if answers are reasonable in addition, subtraction, division, and multiplication problems. 

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

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 Activity   
A clear and simple bead necklace. 

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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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 Lesson plan   
Students use addition, subtraction, doubling and halving to solve story problems. 

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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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 Activity   
Identifying and placing numbers and/or decimals. 

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