Whose Group? Subtraction with Regrouping
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
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
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.
Key Standards Supported
Number And Operations In Base Ten
Use place value understanding to round whole numbers to the nearest 10 or 100.
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.
Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.
Recognize that in a multi-digit whole number, a digit in one place represents ten times what it represents in the place to its right. For example, recognize that 700 ÷ 70 = 10 by applying concepts of place value and division.
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.
Use place value understanding to round multi-digit whole numbers to any place.
Fluently add and subtract multi-digit whole numbers using the standard algorithm.
Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the properties of operations. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.
Find whole-number quotients and remainders with up to four-digit dividends and one-digit divisors, using strategies based on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.