1. This fourth set of Lesson Plans for Standards 3.NBT.A.2 and 4.NBT.B.4 covers the subtraction of whole numbers by using the inverse or opposite relationship between addition and subtraction. In other words, third grade students will count up when solving a subtraction problem. (Third Grade Standard 3.NBT.A.2).
For example, in solving 523 - 384, students will create the following addition problem and solve by counting up:
384 + ? = 523
2. Third grade students will use charts, model their solutions on number lines, explore the commutative and associative properties of addition, practice creating and solving expressions, and will explain any strategies used.
3. These Lesson Plans also include practice problems that assist with the earlier skills of counting up by tens and hundreds from any number up to 900. (Second Grade Standard 2.NBT.B.8).
4. Fourth grade students use the traditional method of subtraction, but should be familiar with the methods used in the earlier grades. (Fourth Grade Standard 4.NBT.B.4).
5. These Lesson Plans include word problems and templates that allow teachers to modify and create additional practice problems for students.