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10 Cards in this Set
- Front
- Back
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Place Values |
The place values chart shows the value of each digit in the numbers. |
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Comparing Numbers |
To compare numbers to see which one is greater, first out if one of the numbers has more digits to the left of the decimal point. |
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Adding Decimals |
When adding decimals, write the addition problem in the vertical form. Be sure to line up the decimal point. Write a decimal point in the answer directly below the decimal points in the problem. The add as you would whole numbers. |
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Subtracting Decimals |
When subtracting decimals, write the subtraction problem in vertical form. Be sure to line up the decimal points. Write a decimal point in the answer directly below the decimal points in the problem. Then subtract as you would with whole numbers. |
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Multiplying Decimals |
when multiplying decimals, multiply as if the decimal numbers were whole numbers. Then count the total number of decimal places to the right of the decimals in the factors. This number will be the number of decimal places in the product. |
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Dividing Decimals |
when dividing decimals, first check if there is a decimal point in the divisor. If there is, move the decimal point to the right to make the divisor a whole number. The move the decimal point in the dividend to the right same number of places you moved the decimal point in the divisor. The decimal point in the quotient directly above the decimal point in the dividend. Then divide as with whole numbers. |
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Fraction to Decimal, Decimals to Fraction |
Any fraction can be as a decimal and any decimal can be renamed as a fraction. To rename a fraction as a decimal, use division. Think of the fraction bar in the fraction as meaning "divide by." For example, 5/8 means " 5 divided by 8." After the 5, write a decimal point and as many zeros as are needed. Then divide by 8 |
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Percent to Decimal, Decimal to Percent |
Percent is an abbreviation of the Latin words per centum, "by the hundred." So percent means "divide by 100." A percent can be written as a decimal. To change a percent to a decimal, first write the percent as a fraction with a denominator of 100, then divide by 100. |
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Finding a Percentage. |
Finding a percentage means finding a percent of a number, you change the percent to a decimal, then multiply it by the number. |
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The average ( Mean ) |
The average, or mean, is a single number used to represent a group of numbers. The average, or mean, of two or more numbers is the sum of the numbers divided by the number of items added. |
