Subtracting by regrouping
Title of Lesson: Subtracting by Regrouping
Objectives:
The students will be able to:
• Subtract by going from right to left, subtract the ones, then the tens, then the hundreds
• Subtract by regrouping the tens, then the hundreds
GPS Standards:
MCC.3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
Preparation:
In preparation for this lesson, I will review the rules for regrouping, new methods, and fun interacting games or examples that may be useful in teaching this lesson. I will print worksheets, one for practice in the classroom and one for assessment.
Materials/Resources:
• Lollipops
• Practice worksheet
• Assessment worksheet
• Pencils
• Smart Board
• manipulatives
Procedures:
I. Introduction
To begin this lesson, I will tell the students that we will be working on subtracting by regrouping with tens and hundreds. Then, I will write a problem on the board. I will divide the class into three groups by giving the students cards of three different colors. Group 1 – blue, group 2 – red, group 3 green. Group one will be the ones place, group two will be the tens place, and group three will be the hundreds place. This will help students get a visual of the math problems. We will “borrow” from one another, but first we needed to separate the class just like we have to separate the number. I will then separate by drawing lines between the ones place and tens place on the number on the board. Then, I will as the students to subtract the ones column. I will tell them that the bottom number is being subtracted from the top number. The bottom number will be larger than the top number. I will ask the class if this is possible, I will wait for their response. Then, I will show that you cannot take away a larger number from a smaller number. “So what can we do?” “Group one – blue or the ones place, will have
Objectives:
The students will be able to:
• Subtract by going from right to left, subtract the ones, then the tens, then the hundreds
• Subtract by regrouping the tens, then the hundreds
GPS Standards:
MCC.3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
Preparation:
In preparation for this lesson, I will review the rules for regrouping, new methods, and fun interacting games or examples that may be useful in teaching this lesson. I will print worksheets, one for practice in the classroom and one for assessment.
Materials/Resources:
• Lollipops
• Practice worksheet
• Assessment worksheet
• Pencils
• Smart Board
• manipulatives
Procedures:
I. Introduction
To begin this lesson, I will tell the students that we will be working on subtracting by regrouping with tens and hundreds. Then, I will write a problem on the board. I will divide the class into three groups by giving the students cards of three different colors. Group 1 – blue, group 2 – red, group 3 green. Group one will be the ones place, group two will be the tens place, and group three will be the hundreds place. This will help students get a visual of the math problems. We will “borrow” from one another, but first we needed to separate the class just like we have to separate the number. I will then separate by drawing lines between the ones place and tens place on the number on the board. Then, I will as the students to subtract the ones column. I will tell them that the bottom number is being subtracted from the top number. The bottom number will be larger than the top number. I will ask the class if this is possible, I will wait for their response. Then, I will show that you cannot take away a larger number from a smaller number. “So what can we do?” “Group one – blue or the ones place, will have