Addition and Subtraction within 1,000
Students will develop deeper understandings of the base ten number system, which will strengthen their abilities to round as well as add and subtract numbers.
Note: Lessons will vary in length, depending on the amount of time you have with students, the resources that you choose to accompany the unit, the level of rigor within each learning target, and any other factors that may contribute to the pacing of your learning progressions. It is recommended that you adjust the pace and length of each learning progression(s) accordingly in response to these factors.
These learning progressions were developed using Next Generation Learning Standards and were cross-walked with the Common Core Standards.
Download the complete Grade 3 Unit 2 framework to customize for your own planning.
Essential Outcomes
Numbers in Base Ten
- 3-NY-NBT.1: Use place value understanding to round whole numbers to the nearest 10 or 100.
- 3-NY-NBT.2: Fluently add and subtract within 1,000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
Operations and Algebraic Thinking
- NY-3.OA.8: Solve two-step word problems posed with whole numbers and having whole-number answers using the four operations.
Other Standards Addressed in this Unit
Numbers in Base Ten
- NY-3.NBT.4a: Understand that the digits of a four-digit number represent amounts of thousands, hundreds, tens, and ones. e.g., 3,245 equals 3 thousands, 2 hundreds, 4 tens, and 5 ones.
- NY-3.NBT.4b: Read and write four-digit numbers using base-ten numerals, number names, and expanded form. e.g., The number 3,245 in expanded form can be written as 3,245= 3,000 + 200 + 40 + 5.
Essential Questions and Big Ideas
- How does understanding place value help you to better understand numbers?
- The base ten number system determines the value of the digits within numbers.
- Numbers are broken into places which are based on powers of 10.
- Rounding numbers shows about how much of a certain place value they hold.
- Expanded form is a way to write numbers broken into the values of each place value.
- What are efficient strategies to add multi digit whole numbers?
- Digits in a number can be added based on place value.
- Add like place values.
- Only 9 of a place can fit in each place.
- Ten of one place makes one of the next largest place value.
- What are efficient strategies to subtract multi digit whole numbers?
- Digits in a number can be subtracted based on place value.
- Subtract like place values.
- If you do not have enough of a place value, regroup one of the next largest place value to create ten more of that place value.
- Subtraction is the inverse to addition.
- Adding on can be used to find a difference.
- How can I solve two-step word problems with addition and subtraction?
- When a word problem has more than one unknown, there is more than one step.
- Finding a difference or comparing requires subtraction.
- Finding a total or combining amounts requires addition.
- Finding a missing part requires subtraction.
Download the complete Grade 3 Unit 2 framework to customize for your own planning.