3.NBT.2 – Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

**Internet Resources (Videos, Websites, etc.)**

DigitWhiz Games (Website and iPad app)

K-5 Math Teaching Resources

Khan Academy

Learn Zillion

- Solve addition problems using the partial sums method
- Solve for unknowns using the commutative property of addition
- Solve addition problems using complements of ten
- Solve addition word problems by identifying key phrases
- Use addition and subtraction fact families to solve for unknown amounts
- Solve subtraction word problems by identifying key phrases
- Solve subtraction problems using a number line
- Solve subtraction problems: using regrouping
- Solve addition problems: using partial sums
- Solve division problems: using equal groups
- Solve addition problems: using complements of 10
- Solve for unknowns: using commutative property
- Check addition and subtraction problems: using the inverse operation
- Solve subtraction problems: using key vocabulary
- Solve subtraction problems: using number line
- Solve for unknowns: using fact families
- Solve addition problems with numbers up to 1,000: regrouping
- Solve addition problems: using key vocabulary

NCTM Illuminations

- Place values: Value of a digit
- Place values: Identify the digit with a particular place value
- Place values: Convert from expanded form
- Addition: Add two numbers up to three digits
- Addition: Add two numbers up to three digits – word problems
- Addition: Complete the addition sentence – up to three digits
- Addition: Balance addition equations – up to three digits
- Addition: Addition patterns over increasing place values
- Subtraction: Subtract numbers up to three digits
- Subtraction: Subtract numbers up to three digits – word problems
- Subtraction: Complete the subtraction sentence – up to three digits
- Subtraction: Balance subtraction equations – up to three digits
- Subtraction: Subtraction patterns over increasing place values
- Properties: Properties of addition
- Properties: Solve using properties of addition

Shodor

Study Jams by Scholastic

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