standard_description: Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.
problem_activity: Task
The teacher will need numeral cards 1–10 and 11–20.
This task can be used with a single student or a small group of students. Each student needs his or her own set of numeral cards.
The teacher asks student(s) to put the numbers in order from the smallest number to the biggest number or in the order they would say them if they were counting. Next, students read the numbers in their arranged order (one student at a time). The teacher records each student’s sequence. Students who have numerals out of order may be able to self-correct as they read what they have done. This, too, should be noted.
If students are able to sequence 1–10, trade sets with them so they have only the 11–20 cards. Use the process described above to have students order the cards and read their results, again, recording the responses. To be clear, some students will have a 1–10 set of cards and other students will have a 11–20 set. This lets students struggling with 1–10 to practice and lets the teacher gather information on those students ready for the "teen" numbers.


aligns: no