# Measurement and geometry

Contents
In 2nd grade, you learned to measure lengths. Now we can measure the length around the edge of an object (perimeter) and how much "space" something takes up on a flat surface (area).

## Time

Solve word problems involving time. Use number lines, digital clocks, and analog clocks.

## Mass

Estimate the mass of items. Solve word problems involving mass.

## Volume

Estimate the volume of items. Solve word problems involving volume.

## Bar graphs

Read and interpret bar graphs. Also, make some graphs of your own!

## Picture graphs

Read and interpret picture graphs. Also, make some graphs of your own!

## Line plots

Read and interpret line plots. Also, make some graphs of your own!

## Area introduction

Area is how we think about how much space something takes in two dimensions, such as comparing how much land one property takes up versus another. In this tutorial, we'll take a look at how area is measured.

## Count unit squares to find area

Find area of shapes by counting unit squares. Some shapes will require combining partial square units to find area. Create rectangles with a given area by covering unit squares.

## Area formula intuition

Transition from counting unit squares to multiplying side length to find area. Measure side lengths with a ruler to find area.

## Multiply to find area

Find area of rectangles by multiplying side lengths. Find a missing side length of a rectangle when given the other side length and area. Compare areas of rectangles presented in images or contexts.

## Area and the distributive property

Use the distributive property to find area of rectangles.

## Decompose figures to find area

Decompose figures into two to three rectangles to find area of entire figure.

## Perimeter

Have you ever wondered how much fencing you need to surround a plot of land? No? Well, you should still go through this tutorial just in case. You'll learn what perimeter is and how to calculate it.

## Comparing area and perimeter

Compare the areas and perimeters of rectangles when given a context or picture.

## Perimeter word problems

Solve real world problems problems involving perimeter.