Guided Lessons

# Double Trouble: Subtraction practise

Double-digit trouble? No problem! Your students will practise their decomposing and regrouping skills in this lesson.
Need extra help for EL students? Try theRegrouping with Base-Ten BlocksPre-lesson.

No standards associated with this content.

No standards associated with this content.

No standards associated with this content.

No standards associated with this content.

No standards associated with this content.

No standards associated with this content.

Which set of standards are you looking for?

Need extra help for EL students? Try theRegrouping with Base-Ten BlocksPre-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.
(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 RegroupingIn 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 maths-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 practise 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.