4.NBT.4 – Fluently add and subtract multi-digit whole numbers using the standard algorithm.

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

K-5 Math Teaching Resources

Khan Academy

NCTM Illuminations

- Addition: Add numbers up to millions
- Addition: Add numbers up to millions: word problems
- Addition: Addition: fill in the missing digits
- Addition: Add 3 or more numbers up to millions
- Addition: Choose numbers with a particular sum
- Subtraction: Subtract numbers up to millions
- Subtraction: Subtract numbers up to millions: word problems
- Subtraction: Subtraction: fill in the missing digits
- Subtraction: Choose numbers with a particular difference

XPMath Games

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