# Measurements

## Rules of Significant Figures

Now that we’ve covered scientific, engineering, and decimal notation, it’s time to learn the rules of significant figures (abbreviated SF, and also referred to as significant digits). Without knowing these rules, you will NOT be able to add, subtract, multiply, or divide any number correctly moving forward. The first video will walk you through how…

## Substituting into Equations and Formula

A major part of this course is algebra-based, namely, learning how manipulate equations, combine like-term, and evaluate expressions. This lesson will give you a sense of what’s to come in future lessons. A formula is an equation expressing some general mathematical or physical fact, such as the formula for the area of a…

## Convert Rates

A rate is a ratio (comparison) of two different quantities possessing different units of measure. For example, speed is a measure of distance per unit time – distance is measurable and so is time. More specific examples of units are: Wage: \$20 per hour Points per game: 14.5 points per game Speed: 15…

## Converting Units using Conversion Factor

Any quantity that is measurable needs a unit to describe how large or small it is relative to another quantity. For example, 1 meter is a unit of length, 1 second is a unit of time, and 1 m/s (one meter per second) is a unit rate. To convert from…

## Engineering Notation

Engineering notation is similar to scientific notation, except for a few differences: The exponent is a multiple of three (for example, -3, 3, 6, etc.) ; and There can be one, two, or three digits to the left of the decimal point, rather than just one digit; to the right of…

## Scientific Notation

If you’ve ever tried multiplying numbers in the millions and billions on your calculator,  you’ve either gotten an error or some number that looks like this: Notice how this calculator condenses the large output with E17. The E17 is the calculators way of writing: null On paper, we can also…