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Decimals Teacher Resources
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There are two Khan Academy videos on representing numbers as decimals, percents, and fractions. This one shows students how to represent a fraction as a decimal and a percent. Sal demonstrates the process used to convert the fraction 7/8 into a decimal and then a percent. This presentation is very well done and would be great at an independent work station or as homework support.
Clear up the confusion and help your learners make the connection between percents, decimals and fractions. This video describes the process needed to write 18% first as a decimal, and then as a fraction in its simplest form. Sal does a succinct job of explaining these concepts.
Decimals are quite often confusing for young mathematicians. Pupils engage in three activities: writing decimal names, understanding place value, and comparing decimals to thousandths. At the end of the lesson, there is a motivating game called beat the clock which will test your students' ability to correctly write decimals. A terrific lesson which should help your mathematicians gain confidence in this important area of math.
Having a good number sense is key to understanding place value. This video clearly explains the place values that comprise a decimal number. It is a very straight forward presentation and would be appropriate for grades 3, 4, or 5. Sal uses multiple colors and expanded notation to describe the value of each number.
Here is a fabulous instructional activity on subtracting decimals with different numbers of decimal places. There are teacher-led activities for learners to engage in, including, modeling decimal subtraction through decimal squares, looking at place value, seeing patterns in decimal numbers, and finding decimal values on a number line. Then, pupils pair off and play an interactive online game that further reinforces the concepts being taught. Finally, each pupil completes a series of worksheets that are embedded in the plan to gain further practice. An outstanding math lesson plan which should lead to meaningful learning.
Mr. Khan reminds us that the most important thing to remember when subtracting decimal numbers is to line up the decimal points. He subtracts 3.600 from 9.005, explaining his thinking as he completes the process. Assign the viewing of this tutorial as homework and then have youngsters come to class ready to practice together!
Mathematicians make representations of fractional parts of a whole and learn that a decimal is another way to represent a fractional part. Understanding is extended by comparing and ordering fractions and decimals on a number line. This high-quality resoucre comes complete with student handouts. Make sure to consider it for addressing Common Core standards in math.
A rational number is a ratio of two integers. Discuss with your class how to convert the rational numbers of repeating decimals to fractions. A good commentary on letting x equal the repeating decimal and multiplying each side of such equation by a power of 10 or 10r, where r is the repeating segment.
One of the trickiest areas of mathematics for youngsters is the relationship between fractions, decimals, and percents. In this impressive presentation, learners get coached on how to convert between fractions and decimals, and vice versa. The graphics and text are clearly understood, and there is a particularly good section on what to do with that pesky decimal point! Some handy practice problems appear on the last couple of slides.
Small groups work together to brainstorm ways we communicate decimals. They practice using word form, expanded form, and standard form, as well as fractions, money, and percentages. They sort word cards, matching decimals expressed in standard, word, and expanded form. Includes links to interactive games, word cards and charts for sorting, an online self-check quiz, exit tickets, and more.
In this math worksheet, students practice multiplication of decimals. Students begin by multiplying whole numbers by decimals, then decimal numbers by decimals, up to the thousandths place. The problems are written both in horizontal and vertical form. Multiplication (mental) of decimals by 10, 100 and 1000 are also included. Hints and clues are provided.