Prealgebra Lectures

Lectures on Prealgebra

Alternative and Long Way to Divide Fractions

One way to divide fractions is to find an LCD and divide across. See the "Short" for a long example. It would've been easier to keep it - change it - flip it.

New Calculator Videos

In recent days, I have been producing some calculator videos focusing on the TI-30xs multiview, one of my favorite scientific calculators, and TI-84 plus.

Topics include math basics, algebra, and probability and statistics.

If you have any ideas for future calculator videos with TI-30xs multiview or TI-84 plus, please e-mail me at jdmathguy@gmail.com.

I added Videos to Math Basics

I'm continuing to go over the basics - making short videos. As I finish the lesson on integers, I discuss the order of operations, expressions, and show the addition property of equality with solving an equation.

Operations with Integers - Videos

I added some videos to my Math Basics playlist.


In the videos, I go over some examples of:

• Integers - Subtraction (2:51)
• Integers - Multiplication (2:52)
• Integers - Division (2:54)
• Integers - Exponents (3:26)
• Integers - Absolute Value (1:51)

All of my new videos are intended to be short.

integers - addition - examples

I'm going back to the basics. As of today, I made two videos on the playlist.

sign rules - concept

On a weekly basis, I'll be producing new videos on my YouTube channel. Anyway, that's the plan.

Calculator Remainder Trick

Today, I'm going to show you how to use any calculator to find the remainder. Let's use an example. 678 divided by 37. First, divide.

Then hit equals.

Subtract the whole number and equals. The remainder is found in the decimal.

Then multiply by the divisor. The divisor is the number you are dividing by. Here, it is 37.

We can check this. The quotient is the answer to a division problem. It has a whole number part and a remainder. The remainder is the leftover. Take the whole number multiply by the divisor and then add the remainder. This should give us the dividend. The dividend is the number you are dividing. Here it is 678.

18*37+12=?

It does work. I get 678. And it will work, every time. 

For more ways on how to use your calculator, check out my youtube channel. If you have any questions or blog ideas, you can e-mail me at jdmathguy@gmail.com

-JD