Description
What our Two-Digit Subtraction with Regrouping: Advanced lesson plan includes
Lesson Objectives and Overview: Two-Digit Subtraction with Regrouping: Advanced teaches students how to subtract using regrouping strategies. By the end of this lesson, students will be able to fluently subtract within 100 using techniques based on place value and properties of operations. This lesson is for students in 1st grade.
Classroom Procedure
Every lesson plan provides you with a classroom procedure page that outlines a step-by-step guide to follow. You do not have to follow the guide exactly. The guide helps you organize the lesson and details when to hand out worksheets. It also lists information in the blue box that you might find useful. You will find the lesson objectives, state standards, and number of class sessions the lesson should take to complete in this area. In addition, it describes the supplies you will need as well as what and how you need to prepare beforehand.
Options for Lesson
Included with this lesson is an “Options for Lesson” section that lists a number of suggestions for activities to add to the lesson or substitutions for the ones already in the lesson. One optional addition to this lesson is to have your students solve practice problems as a large group on whiteboards to ensure that they understand the concept of borrowing a ten and breaking it into ones. You could also use visuals, such as drawings, to help any students who may need an extra explanation. If you have hands-on learners, you can use classroom manipulatives to solidify this concept and begin to challenge your students by moving beyond the tens place to the hundreds to give them a more extensive understanding of regrouping.
Teacher Notes
The teacher notes page includes a paragraph with additional guidelines and things to think about as you begin to plan your lesson. This page also includes lines that you can use to add your own notes as you’re preparing for this lesson.
TWO-DIGIT SUBTRACTION WITH REGROUPING LESSON PLAN CONTENT PAGES
Two-Digit Subtraction with Regrouping
The Two-Digit Subtraction with Regrouping lesson plan includes two content pages. The lesson begins with the the subtraction problem 43 – 27. How do we solve it when the ones column has a smaller number on top? We use regrouping! Regrouping in subtraction is when we borrow, or take from, a larger place value and add it to the smaller place value.
Let’s take a look at our example problem, 43 – 27. When regrouping, we take one ten from the tens place and add it to the ones place. The number 43 represents 4 tens and 3 ones, so we take a ten away from the 4 tens, leaving 3 tens. We then add the ten to the ones, giving us 13 ones. Now, we can solve as usual, starting with the ones place (13 – 7 = 6) followed by the tens place (3 – 2 = 1) for a final answer of 16.
Let’s take a look at a second example, 71 – 43. Again, we take one from the tens place (7 – 1 = 6) and add it to the ones place (1 + 10 = 11). Then, we solve, starting with the ones place (11 – 3 = 8) followed by the tens place (6 – 4 = 2) for a final answer of 28.
Zero in the Ones Place
If the ones place has a zero, we regroup by taking one from the tens place to make the zero into a ten. Then, we solve as usual! Let’s look at an example, 50 – 14. We take one from the tens place (5 – 1 = 4) and add it to the ones place (10 + 0 = 10). Now, we can solve, starting with the ones place (10 – 4 = 6) followed by the tens place (4 – 1 = 3) for a final answer of 36.
Let’s take a look at a final example problem, 80 – 28. Like before, take one from the tens place (8 – 1 = 7) and add it to the ones place (10 + 0 = 10). Finally, solve, starting with the ones place (10 – 8 = 2) and then the tens place (7 – 2 = 5) for an answer of 52.
TWO-DIGIT SUBTRACTION WITH REGROUPING LESSON PLAN WORKSHEETS
The Two-Digit Subtraction with Regrouping lesson plan includes three worksheets: an activity worksheet, a practice worksheet, and a homework assignment. You can refer to the guide on the classroom procedure page to determine when to hand out each worksheet.
CARDS ACTIVITY WORKSHEET
Students will work with a partner to complete the lesson activity. Each pair will cut out the cards on the worksheet and place them face down. They will take turns pulling cards from the stack and solving them on scratch paper. Next, they will check each other’s answers. Each correct answer is worth a point!
TIMER PRACTICE WORKSHEET
For the practice worksheet, students will set a timer for 12 minutes and solve 12 problems using regrouping. They will then write down how many they solved and how many were correct.
TWO-DIGIT SUBTRACTION WITH REGROUPING HOMEWORK ASSIGNMENT
The homework assignment asks students to check if the answers to 12 problems are correct. If they’re not, they will correct the incorrect problems by re-solving them.
Worksheet Answer Keys
This lesson plan includes answer keys for the activity worksheet, the practice worksheet, and the homework assignment. If you choose to administer the lesson pages to your students via PDF, you will need to save a new file that omits these pages. Otherwise, you can simply print out the applicable pages and keep these as reference for yourself when grading assignments.
