### Examples

A 60° angle is decomposed into two angles, one of which is 25°. What is the measure of the other angle?### Clarifications

*Clarification 1:*Instruction includes the connection to angle measure as being additive.

**Subject Area:**Mathematics (B.E.S.T.)

**Grade:**4

**Strand:**Geometric Reasoning

**Standard:**Draw, classify and measure angles.

**Date Adopted or Revised:**08/20

**Status:**State Board Approved

## Related Courses

## Related Access Points

## Related Resources

## Formative Assessments

## Lesson Plans

## Original Student Tutorials

## Problem-Solving Task

## MFAS Formative Assessments

Students are asked to determine an unknown angle measure that is one component of a larger known angle when given the other component.

Students are asked to recognize the additive nature of angles to determine an unknown angle measure.

Students are asked to determine adjacent angle measurements using the additive structure of angle measurement and known angle measurements.

## Original Student Tutorials Mathematics - Grades K-5

Are you up for a challenge? You will use tile designs to explore how angles can be decomposed into smaller angles and how those parts can be shown as addends in equations in this interactive tutorial.

Note: this tutorial exceeds clarification limits and is meant as enrichment for students who met the standards to increase problem-solving skills.

Decompose and compose various angles while exploring clocks and windows in this interactive tutorial.

Note: this tutorial exceeds clarification limits and is meant as enrichment for students to improve their problem-solving skills.

## Student Resources

## Original Student Tutorials

Decompose and compose various angles while exploring clocks and windows in this interactive tutorial.

Note: this tutorial exceeds clarification limits and is meant as enrichment for students to improve their problem-solving skills.

Type: Original Student Tutorial

Are you up for a challenge? You will use tile designs to explore how angles can be decomposed into smaller angles and how those parts can be shown as addends in equations in this interactive tutorial.

Note: this tutorial exceeds clarification limits and is meant as enrichment for students who met the standards to increase problem-solving skills.

Type: Original Student Tutorial

## Problem-Solving Task

The purpose of this task is to give students a problem involving an unknown quantity that has a clear visual representation. Students must understand that the four interior angles of a rectangle are all right angles and that right angles have a measure of 90° and that angle measure is additive.

Type: Problem-Solving Task

## Parent Resources

## Problem-Solving Task

The purpose of this task is to give students a problem involving an unknown quantity that has a clear visual representation. Students must understand that the four interior angles of a rectangle are all right angles and that right angles have a measure of 90° and that angle measure is additive.

Type: Problem-Solving Task