Math Student Help

Examples of how to convert a Decimal figure into a Fraction.

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WEBSITE: http://www.teachertube.com ClanaMan explains what happens if the divisor the number on the outside is a decimal number.

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Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/roundingdecimals.php 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.

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Access full lesson containing this video at: http://www.yourteacher.com/algebra1/decimalequations.php 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.

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Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/addingdecimals.php Students learn to add decimals by first lining up the decimal points, then adding the numbers by column. For example, to add 14.2 + 2.86, first line up the decimal points, then add the digits in the hundredths column, to get 0 + 6, or 6, then add the digits in the tenths column, to get 2 + 8, or 10, so write a 0 in the tenths column and carry the 1 to the units column, then add the digits in units column, to get 1 + 4 + 2, or 7, then add the digits in the tens column, to get 1. So 14.2 + 2.86 = 17.06.

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Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/comparingdecimals.php 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,

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Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/decimalwordproblems.php Students learn to solve word problems that involve adding or subtracting decimals. For example: Margaret is mailing three letters that weigh 3.7 oz., 2.913 oz., and 2.82 oz. What is the combined weight of the letters?

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Learn the difference of how to place decimal points when mul

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Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/multiplyingdecimals.php 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.

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Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/subtractingdecimals.php 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.

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