4th Grade Math Unit 8

Big Idea:

Investigate angle measurements using parts of circles, protractors, and finding unknown angles.

Student Expectations:

Priority TEKS

4.7(C) [Readiness] determine the approximate measures of angles in degrees to the nearest whole number using a protractor

Focus TEKS

4.7(A) [Not Tested] illustrate the measure of an angle as the part of a circle whose center is at the vertex of the angle that is “cut out” by the rays of the angle. Angle measures are limited to whole numbers

4.7(B) [Not Tested] illustrate degrees as the units used to measure an angle, where 1/360 of any circle is 1 degree and an angle that “cuts” n/360 out of any circle whose center is at the angle’s vertex has a measure of n degrees. Angle measures are limited to whole numbers

4.7(D) [Supporting] draw an angle with a given measure

4.7(E) [Supporting] determine the measure of an unknown angle formed by two non-overlapping adjacent angles given one or both angle measures

Ongoing TEKS

4.1(A) [Tools to Know] apply mathematics to problems arising in everyday life, society, and the workplace;

4.1(B) [Tools to Know] use a problem-solving model that incorporates analyzing given information, formulating a plan or strategy, determining a solution, justifying the solution, and evaluating the problem-solving process and the reasonableness of the solution;

4.1(C) [Tools to Know] select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems

4.1(D) [Ways to Show] communicate mathematical ideas, reasoning, and their implications using multiple representations, including symbols, diagrams, graphs, and language as appropriate;

4.1(E) [Ways to Show] create and use representations to organize, record, and communicate mathematical ideas;

4.1(F) [Ways to Show] analyze mathematical relationships to connect and communicate mathematical ideas; and

4.1(G) [Ways to Show] display, explain, and justify mathematical ideas and arguments using precise mathematical language in written or oral communication.

Student Learning Targets:

• I will be able to determine the approximate measure of angles using a protractor.
• I will determine the measure of a missing angle when two angles overlap.
• I will draw an angle using a protractor.
• I will draw the measure of an angle as part of a circle.

Essential Questions:

• How can the precise measure of an angle be measured?
• What strategies can be used to find the measure of an angle?

Extra Information:

Adopted Textbook: Pearson - enVision Math

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