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# Unit 1: Extending whole number operations

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## About this unit

Let's jump into the world of whole numbers! This unit explores extending operations, where we'll tackle bigger numbers and more complex problems. It's a thrilling adventure into math that builds critical thinking and problem-solving skills. Ready to explore and master new mathematical heights? Let's go!

**Unit guides are here!** Power up your classroom with engaging strategies, tools, and activities from Khan Academy’s learning experts. **PDF**

### Learn

### Practice

- Estimate to add multi-digit numbersGet 3 of 4 questions to level up!
- Estimate to subtract multi-digit numbersGet 3 of 4 questions to level up!
- Multi-digit addition and subtraction estimation word problemsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Multi-digit additionGet 3 of 4 questions to level up!
- Multi-digit subtractionGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

### Learn

### Practice

- Multiply by taking out factors of 10Get 5 of 7 questions to level up!
- Estimate multi-digit multiplicationGet 3 of 4 questions to level up!
- Multi-digit multiplication estimation word problemsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Multiply by 1-digit numbers with standard algorithmGet 3 of 4 questions to level up!
- Multiply 2-digit numbersGet 5 of 7 questions to level up!
- Multiply 3-digit by 2-digit numbers using the standard algorithmGet 3 of 4 questions to level up!
- Multiply 3-digit by 2-digit whole numbersGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Learn

### Practice

- Divide by taking out factors of 10Get 3 of 4 questions to level up!
- Estimate multi-digit division problemsGet 3 of 4 questions to level up!
- Multi-digit division estimation word problemsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Basic multi-digit divisionGet 5 of 7 questions to level up!
- Division by 2-digitsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

### Practice

- 2-step estimation word problemsGet 3 of 4 questions to level up!
- Represent multi-step word problems using equationsGet 3 of 4 questions to level up!
- Multi-step word problems with whole numbersGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

Up next for you:

Level up on all the skills in this unit and collect up to 2,000 Mastery points!#### Unit test

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