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# Unit 2: Arithmetic with rational numbers

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## About this unit

The most fundamental branch of math is arithmetic operations. It consists of adding, subtracting, multiplying, and dividing numbers. By this point, performing these operations on whole numbers might be a piece of cake, but now we'll mix those numbers up with decimals and fractions. Get ready to slice and dice!

### Learn

### Practice

- Adding decimals: thousandthsGet 5 of 7 questions to level up!

### Learn

### Practice

- Subtracting decimals: thousandthsGet 5 of 7 questions to level up!

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

### Learn

### Practice

- Divide fractions by whole numbersGet 3 of 4 questions to level up!
- Divide whole numbers by fractionsGet 3 of 4 questions to level up!

### Learn

### Practice

- Dividing fractionsGet 3 of 4 questions to level up!
- Divide mixed numbersGet 3 of 4 questions to level up!
- Interpret fraction divisionGet 3 of 4 questions to level up!
- Dividing fractions word problemsGet 5 of 7 questions to level up!

Level up on the above skills and collect up to 480 Mastery points

### Learn

### Practice

- Decimal multiplication place valueGet 3 of 4 questions to level up!
- Multiplying decimals like 0.847x3.54 (standard algorithm)Get 3 of 4 questions to level up!

### Practice

- Division by 2-digitsGet 3 of 4 questions to level up!
- Multi-digit divisionGet 3 of 4 questions to level up!

### Learn

### Practice

- Divide whole numbers to get a decimalGet 3 of 4 questions to level up!
- Dividing decimals: hundredthsGet 3 of 4 questions to level up!
- Dividing decimals: thousandthsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 560 Mastery points

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Level up on all the skills in this unit and collect up to 1,600 Mastery points!