# Actually Applicable Application Problems and Brainteasers/Materials for Projects: Yarn for Flat Projects

## Overview edit

Knowing how much yarn is needed to complete a project is important if you are making something for your own use or as a gift, to make sure you buy enough yarn, and if you are making the items to sell, to make sure you are charging enough considering the cost of materials.

## General Method edit

- Make a swatch.
- Usually this will be rectangular but it can vary depending on the project.

- Use a high-enough precision scale to weigh the swatch.
- Calculate the swatch's area.
- Divide the swatch's weight by its area to find the weight of yarn needed to make each square inch.
- Multiply the weight of yarn per square inch by the number of square inches in the project to find the total weight of yarn needed for the project.
- If necessary, do a unit conversion to get the amount of yarn into a convenient unit.

## Problems edit

How much yarn would you need to make a scarf 10 inches wide and 4 feet long?

### Make Your Own Problem edit

Pick a project you would like to make, and figure out how much yarn you need for it.