This rule seems random to many students, but it has a beautiful reason for being true.

What Cramer's rule is, and a geometric reason it's true

Solve for Missing Values in Ratio Problems Using Multiplicative Reasoning solves for the missing values in ratio problems by using multiplicative reasoning.

Check for reasonableness of answers using rounding.

Convert distance within the US customary system using ratio reasoning.

Convert distance within the US customary system using ratio reasoning.

Sara's family of 4 people want to go to the safari. Each ticket costs 21 dollars, what is a good estimate for the least amount of money they should bring with them to be able to pay for the tickets?

In the first day of its showing 567 people saw the school play. On the second day 359 people saw it. About how many people watched the play altogether?

👉 Learn how to solve multi-step equations with parenthesis. An equation is a statement stating that two values are equal. A multi-step equation is an equation which can be solved by applying multiple steps of operations to get to the...

In Sara’s school there are 5 classes in 4th grade ,class 1 has 19 students, class 2 has 21 students, class 3 has 23 students, class 4 has 20 students, and class 5 has 19 students. About how many fourth grade students are in the school...

The video is a lecture presentation about the factor and remainder theorems in mathematics. The presenter explains how to use the factor theorem to find factors and remainders of polynomials by substituting specific values and also...

Research assignment: Teach me about spin. Below there are suggested questions, recommended sources and my social media accounts: QUESTIONS: Questions that require less research: 1. This is our first real example of quantization, the...

When you look at a rhythm how good are you at identifying the time signature that most appropriately fits it? How do you know if a rhythm should be in 6/8 or in 3/4, especially when the notes in any given bar add up to the same...

We like to think of ourselves as exceptional beings, but are we really any more special than other animals? Subscribe for regular science videosf='http://bit.ly/RiSubscRibe' target='_blank' rel='nofollow'>videos Humans are the...

You have a full 12 liter jug and empty 5 and 8 liter jugs. Can you measure exactly 6 liters? This problem dates to 1484 and was posed in the context of a milkman making a home delivery to a customer. The story goes this riddle so...

Follow the simple instructions in the video and the result will be a fun mathematical effect! The trick got really popular a couple of years ago, but no one explained exactly why it worked. So in this video I also give the reason why the...

This incredible optical illusion shows how circular motion can result from linear motion! The reason we see the circle has to do with high school geometry. I explain why and give a formal mathematical proof in the video. My blog post for...

Sasha is baking two different types of cookies. The recipe for chocolate chip cookies requires three and one third cups of flour, while the recipe for the sugar cookies requires two and three fourths cups of flour. How much flour will...

Find the error in equations when adding fractions using benchmark fractions.

Understanding the product of a whole number and a proper fraction.

Find the error in equations when subtracting fractions using benchmark fractions.

In this math video we will be converting measurements: inches to feet and inches to centimeters. We will solve this two part question using conversion ratios to write equivalent ratios, also known as a proportion. We will review how to...