Current Unit: Applying Efficient Strategies to Real World Contexts
Students are:
*Continuing to develop and refine the strategies for addition and subtraction within 1000 they worked on in unit 2, with a focus on subtraction. The goal of third grade is for students to move to more efficient and accurate strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. Incremental and number line strategies are often popular for 3rd graders; the standard algorithm (how we were taught) is a 4th grade expectation.
Big Ideas in the Unit:
*Subtraction can be thought of as both removal and difference
*Addition and subtraction have an inverse relationship
*Addition and subtraction reasoning can be used to solve problems involving measurement intervals
Vocabulary:
*add, sum, subtract, difference, operation, place value, round, ones, tens, hundreds, thousands, mass, volume, liter, kilogram
By the end of the unit, students will be introduced to:
*Use an addition and subtraction strategy based on place value, properties of operations, and/or the relationship between addition and subtraction to solve problems to 1,000 accurately and efficiently
*Explain why addition and subtraction strategies work
*Solve addition and subtraction problems in measurement contexts
*Solve problems involving elapsed time
Students are:
*Continuing to develop and refine the strategies for addition and subtraction within 1000 they worked on in unit 2, with a focus on subtraction. The goal of third grade is for students to move to more efficient and accurate strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. Incremental and number line strategies are often popular for 3rd graders; the standard algorithm (how we were taught) is a 4th grade expectation.
Big Ideas in the Unit:
*Subtraction can be thought of as both removal and difference
*Addition and subtraction have an inverse relationship
*Addition and subtraction reasoning can be used to solve problems involving measurement intervals
Vocabulary:
*add, sum, subtract, difference, operation, place value, round, ones, tens, hundreds, thousands, mass, volume, liter, kilogram
By the end of the unit, students will be introduced to:
*Use an addition and subtraction strategy based on place value, properties of operations, and/or the relationship between addition and subtraction to solve problems to 1,000 accurately and efficiently
*Explain why addition and subtraction strategies work
*Solve addition and subtraction problems in measurement contexts
*Solve problems involving elapsed time
Addition and Subtraction Charts
Math Norms
Good Mathematicians...
*Make Sense of mathematics
*Keep Trying even when problems are challenging
*Remember that it's OK To Make Mistakes and revise our thinking
*Share our mathematical ideas with our classmates
*Listen to understand someone else's idea; give each other time to think
*Ask Questions that help us better understand the mathematics
*Agree and Disagree with mathematical ideas, not with each other
*Remember that EVERYONE has Good Mathematical Ideas
Good Mathematicians...
*Make Sense of mathematics
*Keep Trying even when problems are challenging
*Remember that it's OK To Make Mistakes and revise our thinking
*Share our mathematical ideas with our classmates
*Listen to understand someone else's idea; give each other time to think
*Ask Questions that help us better understand the mathematics
*Agree and Disagree with mathematical ideas, not with each other
*Remember that EVERYONE has Good Mathematical Ideas
Counting Collections:
Students work in partnerships or trios to count and record a collection of objects.
Students work in partnerships or trios to count and record a collection of objects.