A Learning Activity is a strategy a teacher chooses to actively
engage students in learning a concept or skill using a digital tool/resource.
You may save this Learning Activity to your hard drive as an .html file by
selecting “File”,then “Save As” from your browser’s
pull down menu. The file name extension must be .html.
The teacher and the students will read the learning targets together (Slide 2).
The teacher will place a basket of about 1,000 objects with each group of 4 students. Each student will create a collection of 211 objects. Review efficient counting strategies (Slide 3).
Check to make sure each student has 211 objects. The teacher will present the problem (Slide 4).
The teacher will walk around and observe how the students removed the objects. The teacher should look for three different methods of removal (all ones, tens and ones, etc.) for sharing purposes.
When sharing, the methods/strategies should build on one another starting with the least efficient and moving to the most efficient. The methods/strategies will be modeled on the number line. See Slide 8 for example.
As the student explains their strategy to the class, the teacher will model on the blank number line.
After modeling the strategies on the number line, the students will record the strategy they used to remove the objects on their personal number line recording sheet.
If there are strategies used the teacher did not model, notate on the checklist/notes page.Check with those students as they are recording their strategy to determine if they need assistance.
5. The teacher may choose to project Slides 5, 6, and 7 on a whiteboard or interactive board to model strategies or record on chart paper (Slides 5, 6, 7).
6. The students will recreate their original collection of 211 objects (Slide 9).
7. Repeat steps 4 and 5 (Slides 11, 12, and 13) with the new problem.
8. Close with a discussion of subtraction strategies (Slide 15).
Assessment Strategies:
The teacher will use the checklist/notes page to formatively assess during the activity.
Print multiple copies of the checklist/notes page to use as a formative assessment.
If the teacher prefers to model strategies on chart paper, chart paper and a chart marker will need to be gathered.
Variation Tips (optional):
Notes or Recommendations (optional):
2019 ALCOS
ALCOS 2.12). Add and subtract within 1000 using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method.
a. Explain that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
Keywords and Search Tags:
decomposing numbers, number line, Subtracting within 1000