
Subtracting decimals Subtracting decimal numbers

What is a Decimal? WEBSITE: Review of decimal numbers

The Rappin' Mathematician Decimals The Rappin' Mathematician raps about adding and subtracting decimals. For more info, visit

Multiplying Decimals - - Pre Algebra Help For a complete lesson on multiplying decimals, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to multiply decimals in the same way that one would multiply whole numbers (vertically). However, at the end of the problem, students must determine where the decimal goes in the answer by counting the total number of digits to the right of the decimal point in the original numbers, then placing the decimal point in the answer so that the answer has this same total number of digits to the right of the decimal point. For example, after multiplying 1.05 x 7.4, since there are a total of 3 digits to the right of the decimal point in the original numbers, place the decimal point in the answer so that there are 3 digits to the right of the decimal point.

Rounding Decimals MA090

Decimal Equations - - Math Help For a complete lesson on decimal equations, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn that if one or more decimals appear in an equation, the first step is to get rid of the decimals by multiplying both sides of the equation by the appropriate power of 10. For example, if the equation reads x + .7 = .9x -- 3, since both decimals are taken to the tenths place, the decimals can be removed by multiplying both sides of the equation by 10, to get 10x + 7 = 9x - 30. Note that all solutions in this lesson are integers.

Geometric Series - Expressing a Decimal as a Rational Number Geometric Series - Expressing a Decimal as a Rational Number. In this video I show how to convert the number 5.1212121212..... into a fraction using geometric series. For more free math videos, visit

Percent and decimals Expressing percentages as decimals. Expressing decimals as percentages.

Percent to Decimal - - Math Help For a complete lesson on converting percents to decimals, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to write percents as decimals and decimals as percents. For example, to write 82% as a decimal, think of 82% as 82 and remember that dividing by 100 moves the decimal point two places to the left, to get 0.82. So 82% can be written as the decimal 0.82. Since a percent can be written as a decimal by moving the decimal point two places to the left, a decimal can be written as a percent by moving the decimal point two places to the right. For example, to write 0.4 as a percent, move the decimal point two places to the right to get 40. So 0.4 can be written as 40%.

Kari Voutilainen Decimal Repeater So far, watchmakers have always used the same type of repeating mechanism. Mechanisms which strike initially the hours then the quarters and then the minutes. A set up which does not allow an easy location when listening at the repeating mechanism. It is this particular problem which initiated Kari Voutilainen's thinking in order to develop a new construction able to strike the time like it is read. He has devised a repeating mechanism which sounds the hours, the ten minute interval and then the exact minutes. This unusual and extraordinary watch is the first repeater of this kind. As is customary to Kari Voutilainen the movement has been executed without the slightest compromise and in keeping with the traditions and standards of the greatest of watchmakers. The movement decoration is beauty in itself: the bridges and the steelwork bevelling, the polishing of the recesses and the drawn grain finish on the bridge rims are all done by hand. The bridge surfaces are adorned with 'Geneva stripes' and the mainplate with circular and snail graining. In Kari Voutilainen's philosophy a repeater should ring loudly and have a crystal clear sound. It is for these reasons that he has approached one of the master casemakers who still posseses the knowledge and employs the traditional methods used since the eigh***th century.

Hexadecimal to Decimal

Multiplying Decimals - How to multiply decimal numbers. For more practice and to create math worksheets, visit Davitily Math Problem Generator at

Arithmetic Basics: Converting Decimals into Fractions Arithmetic Basics: Converting Terminating Decimals into Fractions. In this video, I show how I go about converting a terminating decimal (with small expansion) into a fraction.

Decimal to Percent - - Math Help For a complete lesson on converting decimals to percents, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to write percents as decimals and decimals as percents. For example, to write 82% as a decimal, think of 82% as 82 and remember that dividing by 100 moves the decimal point two places to the left, to get 0.82. So 82% can be written as the decimal 0.82. Since a percent can be written as a decimal by moving the decimal point two places to the left, a decimal can be written as a percent by moving the decimal point two places to the right. For example, to write 0.4 as a percent, move the decimal point two places to the right to get 40. So 0.4 can be written as 40%.

Converting Between Fraction, Decimal & Percent This video illustrates how to convert between fraction, decimal and percent , as required in high school Math courses. For more instructional videos, as well as exercise and answer sheets, go to:

Converting fractions to decimals How to express a fraction as a decimal

Dividing Decimals - - Pre Algebra Help For a complete lesson on dividing decimals, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to divide a decimal by a decimal by first multiplying both decimals by the power of 10 that changes the second decimal to a whole number. For example, to divide 0.16 by 0.8, first multiply both decimals by 10, to get 1.6 8. Next, divide the decimal by the whole number in the same way that one would divide a whole number by a whole number (using long division). However, at the end of the problem, the decimal point is brought straight up from the decimal that is inside the division symbol to the answer that is written on top of the division symbol.

Dividing decimal Dividing decimal numbers

Arabic numerals and the invention of the decimal point

Subtracting Decimals - - Math Help For a complete lesson on subtracting decimals, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to subtract decimals by first lining up the decimal points, then subtracting the numbers by column. For example, to subtract 9.514 -- 1.6, first line up the decimal points, then subtract the digits the thousandths column, to get 4 - 0, or 4, then subtract the digits in the hundredths column, to get 1 -- 0, or 1, then subtract the digits in units column, by borrowing a 1 from the 9 in the units column (which leaves an 8 in the units column), to get 15 -- 6, or 9, then subtract the digits in the units column, to get 8 -- 1, or 7. So 9.514 -- 1.6 = 7.914.

Converting Percents into Fractions and Decimals This video contains numerous examples of how to convert percents into fractions and decimals.

Changing decimals into fractions WEBSITE: How to change a decimal into a fraction

Mulitplication 8: Multiplying decimals (Old video) Multiplying decimals ()

Adding Decimals Adding decimals

Decimals to Fractions Song Visit for more math resources. Learn how to change a fraction to a decimal with this tune sung to Queen's "We Will We Will Rock You."

Pre-Algebra: Converting Fractions and Decimals Fractions can be converted into decimals by simply dividing the numerator by the denominator. This can be done easily with a calculator or it can be done by hand using long division. Professor Burger shows how this is done both with numbers that divide evenly, and numbers that don't divide evenly. Sometimes, when numbers don't divide evently, you are left with a result that has a decimal. In this lesson, you will also learn shorthand for writing numbers with repeating decimals. Taught by Professor Edward Burger, this lesson was selected from a broader, comprehensive course, Pre Algebra. This course and others are available from Thinkwell, Inc. The full course can be found at The full course covers whole numbers, integers, fractions and decimals, variables, expressions, equations and a variety of other pre algebra topics. Founded in 1997, Thinkwell has succeeded in creating a "next-generation" textbook, one that helps students learn and teachers teach. Capitalizing on the power of new technology, Thinkwell products prepare students more effectively for their coursework than any printed textbook can. Thinkwell has assembled a group of talented industry professionals who have shaped the company into the leading provider of technology-based textbooks. For more information about Thinkwell, please visit .

Converting Decimals into Fractions and Percents This video walks through the process for converting decimals into both fractions and percents.

Decimals to Fractions - - Math Help For a complete lesson on converting decimals to fractions, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students use the place value chart to convert decimals to fractions or mixed numbers. The given decimals are taken to the tenths, hundredths, thousandths, or ten-thousandths places, and the resulting fractions or mixed numbers must sometimes be reduced to lowest terms. For example, the decimal 0.4 means 4 tenths, or 4 which reduces to 2/5.

Fractions to Decimals - - Math Help For a complete lesson on converting fractions to decimals, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to convert fractions to decimals. For example, to convert the fraction 7 to a decimal, first read the fraction as "7 tenths". Next, since the tenths place is one place to the right of the decimal point, 7 tenths can be written as the decimal 0.7. To convert 11/20 to a decimal, first find a fraction that is equivalent to 11/20 that has a denominator of 100, so multiply both the numerator and denominator by 5, to get 55/100. Next, read the fraction as "55 hundredths", which can be written as 0.55.

Binary: converting decimal to binary (part 1 of 2) Learn how to convert a decimal number such as 54 to binary using 1s and 0s only.

Tom Lehrer - Decimal - The Frost Report Tom Lehrer explains the Decimal System to British audiences in a reworking of 'New Math' from The Frost Report On Education (21st April 1966).

Change Fractions to Decimals to Percents How to change fraction numbers to decimal numbers, then to percent numbers. Watch full versions of all 3 math videos free of charge for a limited time. Go to for details

The Dewey Decimal Rap Follow Melvil on Facebook! visit 'Dewey' and 'Dewey Decimal Classification' are registered trademarks of OCLC Online Computer Library Center, Inc. Used with Permission. Hi! My name is Melville Dewey! Nice to meet you, how you doing? If you need info, you know where to go, go to your library! Once upon a time in library land, I was looking for information man. I couldnt find it anywhere. Books scattered everywhere. Books over here, books over there, books everywhere, man . . . I swear! So I said there needs to be, organization in the library. Use numbers, one, two, three, and name that system after me! (Chorus) My Dewey Decimal System classifies information son. My Dewey Decimal System organizes information son. My Dewey Decimal System is so very easy to use. My Dewey Decimal System . . . here is what you got to do! Say 000! Generalities. Say 100! Philosophy & Psychology. Say 200! Religion. Say 300! Social Sciences. Say 400! Language. Say 500! Natural Sciences. Say 600! Technology. Say 700! Artistic Stuff. Say 800! Literature. Say 900! Geography & History. (Chorus) But Melville . . . can you tell me where to find info on sharks please? Yeah! I can. No problem. I type it into my computer and . . . KA-BLAM! 597.3 Sharks. But Melville . . . can you tell me where to find info on Italian Recipes please? Yeah! I can. No problem. I type it into my computer and . . . KA-BLAM! 641.8 Italian Recipes. But Dewey . . . can you tell me where to find ...

Rounding a Decimal Mathcast on how to "Round a Decimal". Features 6th graders, "bob" and "paul". From with Mr. Marcos at Lincoln Middle School in Santa Monica, CA.

Basic Math Skills : Rounding Decimals When rounding decimals, round up to the next digit in the sequence if the digit is equal to or greater than five. Round decimals to specific decimal places using tips from a math tutor in this free video on math skills. Expert: Alex Martinez Bio: Alex Martinez grew up in western Massachusetts and is currently a mechanical engineering student at the University of Massachusetts at Amherst. He's set to graduate in 2009 with a Bachelor of Science. Filmmaker: David Pakman

How to properly read a decimal number How to properly read a decimal number and identify the place values.

Arithmetic Basics: Dividing Decimals Arithmetic Basics: Dividing Decimals. In this video, I give the basic idea of how I divide numbers involving decimals and do 3 examples. For more free math videos, visit

Rounding Numbers - Rounding Decimals - For a complete lesson on rounding numbers, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to round a decimal to a given place using the following steps. First, find the digit in the rounding place. Next, look at the digit to the right of the rounding place. If the digit to the right of the rounding place is less than 5, round down, which means that the digit in the rounding place stays the same, and all digits to the right of the place become zero. If the digit to the right of the rounding place is greater than 5, round up, which means add 1 to the digit in the rounding place, and all digits to the right of the rounding place become zero.

Decimal to Hexadecimal

Comparing Decimals - - Pre Algebra Help For a complete lesson on comparing decimals, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to compare decimals by first lining up the decimals, then comparing numbers place-by-place, starting on the left. For example, to compare 17.456 and 17.501, the 1's in the tens place are the same, and the 7's in the units place are the same. However, in the tenths place,