### 5th Grade, Activity 343: Classify Two-Dimensional Figures into Categories Based on their Properties

Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category.

For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.

### 5th Grade, Activity 280: Convert Like Measurement Units Within a Given Measurement System

Convert among different-sized standard measurement units within a given measurement system, and use these conversions in solving multi-step, real-world problems (e.g., convert 5 cm to 0.05 m; 9 ft to 108 in).

### 5th Grade, Activity 217: Apply and Extend Previous Understandings of Multiplication and Division to Multiply and Divide Fractions

Interpret a fraction as division of the numerator by the denominator (a/b = a ÷ b). Solve word problems involving division of whole numbers leading to answers in the form of fractions or mixed numbers, e.g., by using visual fraction models or equations to represent the problem.

### 5th Grade, Activity 171: Use Equivalent Fractions as a Strategy to Add and Subtract Fractions

Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators.

For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)

### 5th Grade, Activity 70: Understand the Place Value System

Use place value understanding to round decimals to any place.