## Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

31 Lesson(s)

### I've Got More Than You

Pepperell, MA
Environment: Rural

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Favorites (36)

Resources (17)

Reflections (1)

### Partners Make Ten

2nd Grade Math » Unit: Sensible Numbers
2nd Grade Math » Unit: Sensible Numbers
York, ME
Environment: Suburban

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Favorites (8)

Resources (11)

Reflections (1)

### How do I solve a change unknown word problem?

Environment: Urban

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Favorites (9)

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Reflections (1)

### Plus Ten Minus Ten

York, ME
Environment: Suburban

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Favorites (10)

Resources (13)

Reflections (2)

### Adding Three-Digit Numbers with Regrouping

Environment: Urban

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Favorites (16)

Resources (13)

Reflections (1)

### Subtracting Across Zeros

Environment: Urban

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Favorites (10)

Resources (16)

Reflections (1)

### Change Unknown Word Problems

Environment: Urban

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Favorites (11)

Resources (15)

Reflections (1)

### Two-Step Word Problems (Result Unknown)

Environment: Urban

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Favorites (10)

Resources (15)

Reflections (1)

### Counting Up to Solve Problems

York, ME
Environment: Suburban

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Favorites (13)

Resources (13)

Reflections (1)

### Understanding Subtraction

York, ME
Environment: Suburban

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Favorites (5)

Resources (16)

Reflections (2)

### Counting with Tens and Hundreds

York, ME
Environment: Suburban

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Resources (10)

Reflections (1)

### Adding Three-Digit Numbers Without Regrouping

Environment: Urban

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Favorites (3)

Resources (15)

Reflections (1)

### From Tens to Nines

York, ME
Environment: Suburban

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Favorites (7)

Resources (11)

Reflections (1)

### How Big Is A Mile?

2nd Grade Math » Unit: Area, Perimeter and More Measurement
2nd Grade Math » Unit: Area, Perimeter and More Measurement
York, ME
Environment: Suburban

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Resources (9)

Reflections (1)

### Getting Bigger and Smaller

York, ME
Environment: Suburban

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Favorites (4)

Resources (9)

Reflections (1)
Common Core Math