Unit 3 - Add, Subtract, Number Composition SUMMARY
Students already know how to add and subtract numbers through 100. In this unit, they learn how to add and subtract with numbers through 500, strategies for addition and subtraction, and how to identify and correct errors in addition and subtraction. They begin by using base-10 blocks, drawings, and place-value charts to solve addition and subtraction problems with sums or minuends up through 500 with and without regrouping.
They learn the meaning of the equals sign, and write various equivalent expressions, including exploring fact families. They learn how numbers are composed of other numbers, and how to decompose numbers in various ways. They use this knowledge to solve addition and subtraction problems mentally.
TEACHER GUIDED LESSONS
Addition Strategies - 10/25
They learn the meaning of the equals sign, and write various equivalent expressions, including exploring fact families. They learn how numbers are composed of other numbers, and how to decompose numbers in various ways. They use this knowledge to solve addition and subtraction problems mentally.
- Addition and Subtraction
- Addition Computation Through 500
- Finding the Difference
- Subtraction and the Equals Symbol
- Decompose Numbers
- Make and Break Numbers
- Break Up Numbers
- Breaking Numbers to Subtract
- Decompose to Subtract
- Choose Friendly Numbers
TEACHER GUIDED LESSONS
Addition Strategies - 10/25