Lesson Plan

Whose Group? Subtraction with Regrouping

Using assistive technology to help students practice math fluency, especially in base ten and subtraction (with regrouping)
Ashley K.
STEM Project Manager
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My Grades 5, 6, 7, 8
My Subjects Math, Science

Students will be able to...


...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. (CCSS.MATH.CONTENT.3.NBT.A.2)

...read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form. Compare two multi-digit numbers based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons. (CCSS.MATH.CONTENT.4.NBT.A.2)


Grades 2 - 4
All Notes
Teacher Notes
Student Notes

1 Hook | 5 minutes

At the beginning of each class, I have students answer a challenging math word problem. On my Promethean Board, I upload the problem of the day, and have students use their iPad to solve it. Students are required to capture an image (or video if the problem is multi-step) of their whiteboard once the timer goes off (5 minute warm up). Do not solve the problem together until the end of the class period.

[Example Multi-Step Math problem]: Sar collected 512 stickers at camp this summer. On her way to school, she gave 219 to her friend Lisa. At school, she gave 48 to her friend Megan. If she keeps the rest for herself, how many stickers does Jessica return home with that day?

2 Direct Instruction

Free to Try, Paid

This portion of the lesson depends on which day of the unit it occurs.

For the first time I introduce this concept (subtraction with regrouping), I will watch the BrainPOP Jr. video with the students. The video can be located Here. We talk about what we learned, and do 1-2 practice problems.

For the second or third time we work on this concept, students will either watch a teacher created screencast (created on Educreations Interactive Whiteboard) to re-teach the process.

More advanced students can be assigned the concept on Wowzers. This product provides a re-teaching sequence built in to the unit. I assign this unit as a class, so if students need it they can use the videos and tools provided at the beginning of their guided & independent practice.

3 Guided & Independent Practice

Free to Try, Paid

Because of how well it adjusts to the student's need, I would use Wowzers for both guided and independent practice. Especially on day two or three, when guided instruction might not be necessary. Another great feature of this product is that if a student masters the subtraction with regrouping, they can be assigned a harder concept within the domain.

Students spend 15-20 minutes playing this game-based product per day within the unit. By the third day, they will take the quiz provided by Wowzers, and continue through the sequence based on their overall score. Because it curates their performance data in real time, I can easily check in on every student, even if I am helping one child with a specific problem.

If necessary, Wowzers material can be replayed for students who need the extra practice and assigned for homework.

4 Wrap-up / Assessment

Students will go back to the original problem of the day, and retry the problem after the day of practice. Students should capture their screens as they complete each problem, and submit them to the teacher by the end of the class period. In my classes, this final screencast is graded as classwork. Often, I will use this as a quiz grade if it is on the third or fourth day of study.