### 4th Grade, Activity 419: Geometric Measurement: Understand Concepts of Angle and Measure Angles

Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:

c. An angle that turns through n one-degree angles is said to have an angle measure of n degrees.

### 4th Grade, Activity 386: Solve Problems Involving Measurement and Conversion of Measurements from a Larger Unit to a Smaller Unit (Measure Problems Solving)

Apply the area and perimeter formulas for rectangles in real-world and mathematical problems. For example, find the width of a rectangular room given the area of the flooring and the length, by viewing the area formula as a multiplication equation with an unknown factor.

### 4th Grade, Activity 237: Build Fractions from Unit Fractions by Applying and Extending Previous Understandings of Operations on Whole Numbers

Understand a fraction a/b with a > 1 as a sum of fractions 1/b. (Denominators are limited to 2, 3, 4, 5, 6, 8, 10, 12, and 100.)

a. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole. Example: 3/4 = 1/4 + 1/4 + 1/4

### 4th Grade, Activity 87: Gain Familiarity with Factors and Multiples

Using whole numbers in the range 1–100.

c. Determine whether a given whole number is a multiple of a given one-digit number.