August 27, 2015
|
by Laura Crotts

Lesson plan

Double Trouble: Subtraction Practice

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Do you need extra help for EL students? Try the Regrouping with Base-Ten Blocks pre-lesson.
EL Adjustments
Grade Subject View aligned standards
Do you need extra help for EL students? Try the Regrouping with Base-Ten Blocks pre-lesson.

Students will be able to accurately subtract two-digit problems with regrouping.

The adjustment to the whole group lesson is a modification to differentiate for children who are English learners.
EL adjustments
(5 minutes)
  • Gather students together in a circle. On a small whiteboard, write the subtraction problem 31 – 16, vertically. Say, "I have 31 delicious cupcakes. I give 16 away to my friends. How many do I have left?" Explain to the students that to solve this problem, we can use base-ten blocks.
  • Get out base-ten blocks. Have a student create the total number of cupcakes and place the blocks on the place value chart.
  • Say, "I want to take 16 cupcakes away. Hmm. I see that I can take one group of ten, which is equal to ten ones. But I only have one 1 in my ones place! What should I do?"
(5 minutes)
  • Allow a few students to offer ideas. Next, explain to the students that regrouping in subtraction means borrowing value from a higher place value. Show students how to exchange one group of ten for ten ones. Place the ten ones on the place value chart in the correct column.
  • Model how to take 16 away. Ask students to count the remaining blocks.
  • Say, "By regrouping my blocks, I was able to figure out that I only have 15 cupcakes left!"
  • Ask students to do a think-pair-share to explain the strategy of regrouping.
(20 minutes)
  • Pass out the game sheets for Math-Go-Round and the necessary materials.
  • Review the rules on the game sheets with the students.
  • Model playing the game with a student volunteer.
  • Put students in partnerships and monitor the students as they play, providing support as needed.
(15 minutes)
  • Hand out the In the Jungle: Subtraction Practice worksheet to each student.
  • Have students complete the worksheet independently, providing access to manipulatives to support students in using various strategies.

Enrichment: Assign a game sheet at a more challenging level.

Support: Write problems in a place value chart for students. Give students manipulatives to help them see physical evidence of subtraction.

(5 minutes)
  • Collect the worksheets and use them as a formative assessment to check student understanding of subtracting two-digit numbers with regrouping.
(5 minutes)
  • Have a discussion with your students. Potential guiding questions include:
    • What does it mean to regroup?
    • When would you need to regroup? How do you know?
  • Instruct your students to create illustrations on the board to help them in their explanations.

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