Unformatted text preview: 7 by 11, then the result is 4.27272727… = 4.(27) Operations with decimal fractions
Addition and subtraction of decimals. These operations are executed as well as an addition and a subtraction of
whole numbers. It is only necessary to write the corresponding decimal places one under another.
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Multiplication of decimals. At first stage let’s multiply the fractions as integers, not taking a decimal point into
consideration. After this we use the following rule: a number of decimal places in a product is equal to a sum of
numbers of decimal places in all factors. Note: before putting the decimal point in the product it is prohibited
to reject zeros in the end of it !
Example. A sum of numbers of decimal places in factors is equal: 3 + 4 = 7. A sum of digits in the product is 6.
Therefore, it is necessary to add one zero to the left: 0197056 and to put before this a decimal point:
Division of decimals.
Division of decimal fraction by integer.
If a dividend is less than a divisor, write zero in an integer part of a quotient and put after it a decimal point.
Then, not taking...
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- Spring '13
- Elementary arithmetic, college entrance exam