1. This third set of Lesson Plans for Standards 3.NBT.A.2 and 4.NBT.B.4 covers the subtraction of whole numbers using a strategy that increases students' understanding of place value.
2. Third grade students subtract whole numbers by expanding the lower number and then counting down from the higher number incrementally. (Third Grade Standard 3.NBT.A.2).
For example: 237 - 56 =
237 - 50 = 187 (Students can count down as 227, 217, 207, 197, and 187)
187 - 6 = 181
3. Third grade students will model their solutions on number lines and explain any strategies used.
4. These Lesson Plans also include practice problems that assist with the earlier skills of counting down by tens and hundreds from any number up to 900. (Second Grade Standard 2.NBT.B.8).
5. Fourth grade students use the traditional method of subtraction, but should be familiar with methods used in the earlier grade. (Fourth Grade Standard 4.NBT.B.4).
6. These Lesson Plans include word problems and templates that allow teachers to modify and create additional practice problems for students.