Watch Video on Rounding Numbers - Rounding Decimals
Monday, August 17th, 2009
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.
Duration : 0:1:27
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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Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/fractiontodecimal.php Students learn to convert fractions to decimals. For example, to convert the fraction 7/10 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.
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/percenttodecimal.php Students learn to write percents as decimals and decimals as percents. For example, to write 82% as a decimal, think of 82% as 82/100, 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%.