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# Unit 12: Operations and Algebra 159-175

1,500 possible mastery points

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Quiz

Unit test

### Practice

- Relate addition and subtractionGet 5 of 7 questions to level up!

### Learn

### Practice

- Add within 20 visuallyGet 5 of 7 questions to level up!
- Add within 20Get 5 of 7 questions to level up!
- Add 3 numbersGet 5 of 7 questions to level up!

### Learn

### Practice

- Subtract within 20 visuallyGet 5 of 7 questions to level up!
- Subtract within 20Get 5 of 7 questions to level up!

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

### Learn

### Practice

- Adding with arraysGet 3 of 4 questions to level up!
- Array word problemsGet 3 of 4 questions to level up!

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

### Practice

- Equal signGet 5 of 7 questions to level up!

### Learn

- No videos or articles available in this lesson

### Practice

- Find missing number (add and subtract within 20)Get 5 of 7 questions to level up!

### Learn

### Practice

- Addition and subtraction word problems 1Get 5 of 7 questions to level up!
- Addition and subtraction word problems 2Get 5 of 7 questions to level up!
- Add and subtract within 20 word problemsGet 5 of 7 questions to level up!

Level up on the above skills and collect up to 400 Mastery points

### Learn

### Practice

- Add and subtract within 20 word problemsGet 5 of 7 questions to level up!
- Word problems with "more" and "fewer" 2Get 5 of 7 questions to level up!

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

Level up on all the skills in this unit and collect up to 1600 Mastery points!