Birds of a feather flock together, so it's easy to estimate their number. Pupils watch an installment of a larger Real-Life Math series in which a zookeeper explains how she uses math to estimate the number of birds. They then try out...

Are there more fish in the ocean or stars in the galaxy? The video begins with explaining the old method for estimating the number of fish in the ocean. Then it details the new method using SONAR. The differences in estimates lead...

Ever wonder if you could carry a million dollars? A video tutorial uses money to demonstrate estimation calculations. Using known values, the narrator builds an approximation for the weight of a million dollars. 

Is there a person on Earth who has the same exact number of body hairs as you? The video describes a process using the Pigeonhole Principle to prove that this is definitely possible. The film goes on to consider other examples and...

Make an estimate by getting in line. The class works with scatter plots and lines of best fit to make an estimate for given values. Pupils determine whether there is a positive or negative correlation and draw a best-fit line. Using the...

Here's an AP Calculus video that provides a discussion on determining an approximate for the area under a curve by calculating the sum of areas of rectangles that is smaller than the area and by finding the sum of areas of...

Large numbers don't have to be a drag to work with. The video shows viewers how to estimate a large product of numbers. This involves first converting the numbers to scientific notation and then applying multiplication.

Learn how to do approximations to find a quotient. Given some large numbers to divide, how can this problem be tackled? It's often a good idea to do an approximation first as this can help to be in the ballpark in finding the solution....

Powers of 10 are about moving the decimal around. The instructor illustrates how to move the decimal when it's ten percent or it's one percent. Once you understand this procedure you can do the mental math, in your head of course!

What are compatible numbers? What are they used for? Is it like estimating? Is it like rounding numbers? The teacher will answer these questions and explain how to use compatible numbers.

Using a graph, a bullion cube, and a harmonica case, this math guru shows how to estimate the volume with cubes. He explains how to multiply fractions together to estimate volume. This video may be too general for struggling learners.

Kids might enjoy this dramatic presentation on estimating surface area. The fake Transylvanian accent is a bit distracting but the problem solving practices are sound. Dr. Crazy Pants rounds his decimal measurements then multiplies...

Powers of 10 are about moving the decimal around. The instructor illustrates how to move the decimal when it's ten percent or it's one percent. Once you understand this procedure you can do the mental math, in your head of course!

Finishing up this practice MTEL Math test, Sal guides the viewer through questions 41-45, explaining his thought processes. The problem set in this video features skills such as median and mean, percentages, and probability, all of which...

Are you worried about the MTEL? Never fear—Sal is here! Designed for adults seeking their teaching credentials in Massachusetts, this series of videos guides future teachers through a practice test for the Math MTEL. The valuable...

This video shows how to estimate decimal addition in the context of a word problem. Practice problems are available. [3:01]

A learning module where students using their counting skills to fill a bath tub with water. Through the module, students will use their skills of estimation too.

Helpful math video tutorials covering topics related to whole numbers including addition, division, estimation, expanded form, exponents, multiplication, order of operations, subtraction, rounding, and more. Choose a teacher and watch...

Sal estimates the length of an object when given the length of another object. Includes a video, transcript, and question and answer section. [2:02]

Step by step, this lesson will show you how to add up the number of squares on the grid that are covered/contained by the shape in order to find the area of a figure. It is 4 of 7 in the series titled "Finding Area with a Grid."

Following this lesson, you'll be able to use squares to find the total surface area of a figure. It is 6 of 7 in the series titled "Finding Surface Area with Squares."

This lesson demonstrates rounding up or down to the thousandths place in a decimal. It is 10 of 10 in the series titled "Rounding to the Thousandths Place."

The fact that you can estimate the surface area of an object by rounding each of the relevant dimensions to the nearest number will be discussed in this lesson.

Don't be confused by significant figures. Let Tyler DeWitt introduce significant figures, and more specifically how to round for multiplication and division using significant digits. [7:10]